Fix Gradle wrapper, add UT coverage to CI pipeline

[anurag-paliwal]

Fix Gradle wrapper, add UT coverage to CI pipeline

Description (Describe in detail the fix made) :

• Fixes gradle wrapper so that users do not have to install gradle separately and can use bundled wrapper for quick setup. [I'll update readme and CI to use wrapper in subsequent PRs to remove use of deprecated APIs.]
  
• Fixes ORC UTs to use static project ID instead of depending on env var.
  
• Add workflow to run unit test and coverage tool in CI.
  
• Codecov will report diff as comments on subsequent PRs (after this is merged to master) and can be viewed at https://app.codecov.io/gh/GoogleCloudPlatform/dlp-dataflow-deidentification/pulls.

Bug ID (if any) : b/303544224

Public Documentation (if any) :

Used codecov.io integration.

TESTED (Test Cases with scenario and description - must have 1 positive and 1 negative scenario) :

No code change and CI Run passes.

[saurabhgadia4]

Thanks Anurag. Will this plugin bot also output the incremental coverage for individual files changed in the PR - example?

[anurag-paliwal]

Thanks Anurag. Will this plugin bot also output the incremental coverage for individual files changed in the PR - example?

@saurabhgadia4 - it can but github won't really render it that nicely. Honestly for dev experience the IDE will give a much better experience while these checks can be kept on github more as a overall health marker + preventing regressions. Example:

[saurabhgadia4]

Thanks Anurag. Will this plugin bot also output the incremental coverage for individual files changed in the PR - example?

@saurabhgadia4 - it can but github won't really render it that nicely. Honestly for dev experience the IDE will give a much better experience while these checks can be kept on github more as a overall health marker + preventing regressions. Example:

Sounds good. At the very least we should have the incremental coverage for the file changes introduced by PR.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@9984855). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #166   +/-   ##
=========================================
  Coverage          ?   13.06%           
  Complexity        ?       63           
=========================================
  Files             ?       51           
  Lines             ?     2365           
  Branches          ?      202           
=========================================
  Hits              ?      309           
  Misses            ?     2037           
  Partials          ?       19           

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