test: generate coverage profile during e2e tests

[qweeah]

What this PR does / why we need it:
This PR updates E2E test infra to generate test coverage profile when running e2e test. If the build is triggered by tagging and the tag starts with v (a release), e2e test will be ran directly on non-instrumented application.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #900.

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov-commenter]

Codecov Report

Merging #903 (56adf95) into main (60eec26) will increase coverage by 10.96%.
The diff coverage is n/a.

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@@             Coverage Diff             @@
##             main     #903       +/-   ##
===========================================
+ Coverage   67.79%   78.76%   +10.96%     
===========================================
  Files          22       52       +30     
  Lines         860     2839     +1979     
===========================================
+ Hits          583     2236     +1653     
- Misses        232      429      +197     
- Partials       45      174      +129     

see 36 files with indirect coverage changes

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[TerryHowe]

LGTM

[shizhMSFT]

LGTM