Allow to change OcCollector Service name via LINKERD2_PROXY_TRACING_S…

[GrigoriyMikhalkin]

Solves linkerd/linkerd2#11157

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 67.63%. Comparing base (96124bc) to head (952951a).
Report is 256 commits behind head on main.

❗ Current head 952951a differs from pull request most recent head 3fd2bf1

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2856      +/-   ##
==========================================
- Coverage   67.68%   67.63%   -0.05%     
==========================================
  Files         332      333       +1     
  Lines       15158    15182      +24     
==========================================
+ Hits        10259    10269      +10     
- Misses       4899     4913      +14     

Files	Coverage Δ
linkerd/app/src/oc_collector.rs	26.08% <ø> (ø)
linkerd/app/src/env.rs	59.15% <50.00%> (-0.24%)	⬇️

... and 14 files with indirect coverage changes

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[olix0r]

For the sake of consistency, we already have:

pub const ENV_TRACE_ATTRIBUTES_PATH: &str = "LINKERD2_PROXY_TRACE_ATTRIBUTES_PATH";

can we call this LINKERD2_PROXY_TRACE_SERVICE_NAME and group the definitions?

[GrigoriyMikhalkin]

Done