fix: switch gix TLS backend from native-tls to rustls

[jmacd]

Replace blocking-http-transport-reqwest-native-tls with blocking-http-transport-reqwest-rust-tls in weaver_common to avoid TLS conflicts for downstream consumers that use reqwest with rustls.

Remove the now-unnecessary openssl workspace dependency.

This helps with an otel-arrow PR attempting the weaver update translated into broken tests because of TLS mismatches open-telemetry/otel-arrow#2368.

[lquerel]

LGTM.

I'd like to provide a bit more context for the other Weaver maintainers.

The OTel Dataflow Engine (aka otel-arrow) has been using Weaver for some time to generate synthetic traffic compatible with a semantic convention registry. This is conceptually similar to weaver registry emit, but implemented as a receiver in the collector. We rely heavily on this traffic_gen receiver across nearly all our tests, including some performance benchmarks.

In addition, we have a requirement to support pluggable crypto libraries in order to handle deployments that require FIPS-compliant cryptography.

The change requested by Joshua fits within this context. From my perspective, this does not introduce any issue for Weaver, but I'd prefer to let other maintainers (@jsuereth @jerbly @lmolkova ) weigh in as well, since I'm somewhat both judge and stakeholder in this specific case.

[jerbly]

We should do a dummy cargo dist run to check this builds correctly on all platforms.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.2%. Comparing base (21c405e) to head (8053850).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1302     +/-   ##
=======================================
- Coverage   81.2%   81.2%   -0.1%     
=======================================
  Files        111     111             
  Lines       9371    9371             
=======================================
- Hits        7617    7614      -3     
- Misses      1754    1757      +3     

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[jsuereth]

@jmacd We had issues at one point with our docker image and this, where the image builds, but fails to run - Just want to confirm this was tests on this patch.