feat: Reduce code duplicacy in chaos-workflow package

[SohamRatnaparkhi]

Proposed changes

Solves issue #4008

This PR adds 2 helper functions:

1. updateManifestLabels - To set the manifest labels
2. generateWeightsFromManifest - To generate new weights based on manifest labels.

Earlier the code in these functions was separately repeated at various instances. To avoid code repetition, this PR involves creating separate helper functions for the repeated code and calling these functions at appropriate instances.

Types of changes

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• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices applies)

Checklist

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• I have read the CONTRIBUTING doc
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• I have added tests that prove my fix is effective or that my feature works (if appropriate)
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Dependency

• Please add the links to the dependent PR need to be merged before this (if any).

[namkyu1999]

Please check DCO!

[SohamRatnaparkhi]

Please check DCO!

Rebased the commits and signed them 👍

[Saranya-jena]

LGTM 🚀

[gdsoumya]

the if block should also be using the same updateLabels function or else if logic changes in the function or here it will cause a discrepancy in the labels.

[gdsoumya]

LGTM! 🚀