Add additional values field to migration chart for CPD use case

[bluzarraga]

What this PR does / why we need it: CPD noted a scenario where Argo can pull from the wrong repository (specifically trying to pull from the premium repo instead of the free and vice versa)

Which issue(s) this PR fixes:
Fixes # https://github.ibm.com/PrivateCloud-analytics/CPD-Quality/issues/70357

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1. How the test is done?

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[bluzarraga]

Verified that the new logic works as expected. New priority list is as follows:

1. Values.global.installConfigImagePullPrefix
2. Values.cpfs.imagePullPrefix
3. Values.global.imagePullPrefix

[mandymchu]

one minor change needed is the migration chart version
the third digit of the migration chart version has to be incremented

[Daniel-Fan]

Close as no longer needed