fix(otel): enable gzip and https OTLP export

[ericcurtin]

Summary

Enable gzip and https:// OTLP export. Both failed at startup.

Related Issue

Closes #3899

Changes

• Enable gzip-tonic, tls-aws-lc, tls-roots on opentelemetry-otlp.
• Trust platform roots for https:// endpoints (tonic trusts none by default).
• TLS and gzip option on the shared test collector, plus an end-to-end test.
• Docs: https:// and OTEL_EXPORTER_OTLP_COMPRESSION=gzip.

Testing

• Checks appropriate to the affected code and behavior pass
• Unit tests added/updated (if applicable)
• E2E tests added/updated (if applicable)

cargo fmt, cargo clippy and cargo test for openshell-otel, openshell-otel-test-support, and the Docker driver OTLP test. mise run docs passes. The new test fails with UnknownIssuer without the roots change.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)

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[ericcurtin]

@johntmyers @elezar PTAL when you get a chance, and /ok to test 325922aaf025148eb23afe6eb48dd112c3172db9 if it looks good. Thank you!