chore: add language to profile labels

[nolanmar511]

Fixes #196
This change also removes some unused variables from test-profiler.ts.

[codecov]

Codecov Report

Merging #196 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   89.94%   89.94%           
=======================================
  Files           6        6           
  Lines         388      388           
  Branches       62       62           
=======================================
  Hits          349      349           
  Misses         39       39

Impacted Files	Coverage Δ
ts/src/profiler.ts	95.73% <100%> (ø)	⬆️

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[aalexand]

@nolanmar511 the Kokoro build failed?

[nolanmar511]

Kokoro build failed on Node10, because the program did not finish profiling before the the tests timed out.
I'm re-running the test, but may also need to look more into why the test timed out on node10.

[aalexand]

@nolanmar511 I don't know what I was thinking when I approved this. The language needs to be added as a deployment label, not as a profile label. #194 (which this PR doesn't link but it should have) clearly says so. Please rollback ASAP and fix properly.