Remove username formatting(convert lowercase) while saving the user

[kk-r]

Resolves: #288

Changes

• Update user exists check logic for both lowercase & mixed-case username
  • Using LOWER(github_login) to prevent if user changed his username from mixed-case to lowercase in GitHub.
• Store updated username if the username in database is incorrect.
• Update existing testcase to support when new username contains mixed-case letters.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run API Unit Tests, Lint Checks, API Design, Golden Files with make api-check
• Run UI Unit Tests, Lint Checks with make ui-check
• Commit messages follow commit message best practices

[tekton-robot]

Hi @kk-r. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[pratap0007]

/ok-to-test

[pratap0007]

/lgtm

[vinamra28]

@kk-r can you please squash the commits as well?

[kk-r]

@vinamra28 Sure, will do!

[sm43]

Thanks :)
/approve
/meow

[tekton-robot]

@sm43:

In response to this:

Thanks :)
/approve
/meow

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[vinamra28]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sm43, vinamra28

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