[xscraper] add Profiles support

[florianl]

Description

Implement scraper for Profiles.

This will help implement receiver parts like open-telemetry/opentelemetry-collector-contrib#42843.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.12%. Comparing base (116c181) to head (1ecee8d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13915      +/-   ##
==========================================
- Coverage   92.15%   92.12%   -0.03%     
==========================================
  Files         663      666       +3     
  Lines       41387    41438      +51     
==========================================
+ Hits        38140    38176      +36     
- Misses       2211     2221      +10     
- Partials     1036     1041       +5     

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[florianl]

@dmitryax or @dmathieu - can this change get merged?

[mx-psi]

Can you take a look at the failing tests?

[florianl]

@mx-psi make tidy seemed to resole the issue.

The error now seems to be receiver/expvarreceiver and unrelated to this change:

=== Failed
ERROR rerun aborted because previous run had a suspected panic and some test may not have run
=== FAIL: . TestLoadConfig/expvar/default (0.00s)

=== FAIL: . TestLoadConfig (0.00s)
panic: cannot handle unexported field at {*expvarreceiver.Config}.ClientConfig.Cookies.value:
		"go.opentelemetry.io/collector/config/configoptional".Optional[go.opentelemetry.io/collector/config/confighttp.CookiesConfig]
	consider using cmpopts.EquateComparable to compare comparable Go types [recovered]
	panic: cannot handle unexported field at {*expvarreceiver.Config}.ClientConfig.Cookies.value:
		"go.opentelemetry.io/collector/config/configoptional".Optional[go.opentelemetry.io/collector/config/confighttp.CookiesConfig]
	consider using cmpopts.EquateComparable to compare comparable Go types

goroutine 92 [running]:
testing.tRunner.func1.2({0x14167a0, 0xc00019a450})
	/opt/hostedtoolcache/go/1.24.10/x64/src/testing/testing.go:1734 +0x3eb
testing.tRunner.func1()
	/opt/hostedtoolcache/go/1.24.10/x64/src/testing/testing.go:1737 +0x696
panic({0x14167a0?, 0xc00019a450?})
	/opt/hostedtoolcache/go/1.24.10/x64/src/runtime/panic.go:792 +0x132
github.com/google/go-cmp/cmp.validator.apply({{}}, 0xc0003b3e00, {0x14a65e0?, 0xc000152720?, 0x1?}, {0x14a65e0?, 0xc000152ea0?, 0x1efe640?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/options.go:256 +0x66e
github.com/google/go-cmp/cmp.(*state).tryOptions(0xc0003b3e00, {0x1788cd0, 0x14a65e0}, {0x14a65e0?, 0xc000152720?, 0x4bee59?}, {0x14a65e0?, 0xc000152ea0?, 0x4c0ac9?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:306 +0x13a
github.com/google/go-cmp/cmp.(*state).compareAny(0xc0003b3e00, {0x1772e90, 0xc000148d00})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:261 +0x729
github.com/google/go-cmp/cmp.(*state).compareStruct(0xc0003b3e00, {0x1788cd0, 0x151c280}, {0x151c280?, 0xc000152720?, 0x1?}, {0x151c280?, 0xc000152ea0?, 0x4c0ac9?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:414 +0xa09
github.com/google/go-cmp/cmp.(*state).compareAny(0xc0003b3e00, {0x1772e90, 0xc000148700})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:289 +0x158c
github.com/google/go-cmp/cmp.(*state).compareStruct(0xc0003b3e00, {0x1788cd0, 0x1599e80}, {0x1599e80?, 0xc000152528?, 0x0?}, {0x1599e80?, 0xc000152ca8?, 0x4c0ac9?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:414 +0xa09
github.com/google/go-cmp/cmp.(*state).compareAny(0xc0003b3e00, {0x1772e90, 0xc000148500})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:289 +0x158c
github.com/google/go-cmp/cmp.(*state).compareStruct(0xc0003b3e00, {0x1788cd0, 0x1500fe0}, {0x1500fe0?, 0xc000152508?, 0x32?}, {0x1500fe0?, 0xc000152c88?, 0x0?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:414 +0xa09
github.com/google/go-cmp/cmp.(*state).compareAny(0xc0003b3e00, {0x1772f20, 0xc00032c7c0})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:289 +0x158c
github.com/google/go-cmp/cmp.(*state).comparePtr(0xc0003b3e00, {0x1788cd0, 0x147dbe0}, {0x147dbe0?, 0xc000152508?, 0x40?}, {0x147dbe0?, 0xc000152c88?, 0x4b7c60?})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:566 +0x7ef
github.com/google/go-cmp/cmp.(*state).compareAny(0xc0003b3e00, {0x1772fb0, 0xc00032c780})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:295 +0x13d2
github.com/google/go-cmp/cmp.Diff({0x147dbe0, 0xc000152508}, {0x147dbe0, 0xc000152c88}, {0xc0002284e0, 0x2, 0x2})
	/home/runner/go/pkg/mod/github.com/google/go-cmp@v0.7.0/cmp/compare.go:122 +0xc7
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/expvarreceiver.TestLoadConfig.func1(0xc000185a40)
	/tmp/contrib/receiver/expvarreceiver/config_test.go:88 +0x445
testing.tRunner(0xc000185a40, 0xc0000be820)
	/opt/hostedtoolcache/go/1.24.10/x64/src/testing/testing.go:1792 +0x226
created by testing.(*T).Run in goroutine 3
	/opt/hostedtoolcache/go/1.24.10/x64/src/testing/testing.go:1851 +0x8f3

DONE 24 tests, 2 failures in 1.066s
make[3]: *** [../../Makefile.Common:121: test] Error 3
make[2]: *** [Makefile:254: receiver/expvarreceiver] Error 2
make[1]: *** [Makefile:175: gotest] Error 2
make: *** [Makefile:214: check-contrib] Error 2