inherit immutable fields in placeholder pod reconciler

[OliverMKing]

Description

Makes the placeholder pod reconciler compatible with immutable fields by inheriting the immutable fields into the reconciled manifests.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

E2e and unit tested

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my 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

[coveralls]

Pull Request Test Coverage Report for Build 7614611683

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 81.912%

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Totals
Change from base Build 7492990816:	-0.05%
Covered Lines:	2545
Relevant Lines:	3107

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💛 - Coveralls

[OliverMKing]

/ok-to-test sha=e000c15