[nfc] Update rules_rust, further rust cleanup

[fhanau]

Changes:

• Update rules_rust and cargo-bazel to the latest version. Add generate_target_compatible_with=False, otherwise this update would result in unnecessarily listing the supported platforms in each build file. Similarly, remove a workaround where "wasm32-unknown-unknown" was among the supported platforms, which is no longer needed.
• Add -C embed-bitcode=no to the rust flags (a free win as this is only needed when LTO is enabled).
• Remove addr2line (no longer needed) and libc (only used indirectly, no need to pin/specify it) from the pinned crates
• Update flate2 pin, although the latest version was apparently already being used
• Remove unused rules_foreign_cc from WORKSPACE

Note that based on the files being changed this does not affect upstream, but the corresponding upstream PR can still be a good reference as there is significant overlap