Soft delete join test fix

[Mitika-d]

Fix TestCustomizeColumn with quoted identifiers and fix misleading TestJoinWithSoftDeleted test with correct checks.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• TestCustomizeColumn
• TestJoinWithSoftDeleted

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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