Add pod override fields affinity and tolerations

[PasinduDissMrYum]

Description

Please include a summary of the change and which issue is fixed.
List any dependencies that are required for this change.

Fixes # (issue)
This PR adds the pod overrides affinity and tolerations, unfortunately nodeSelector field is not enough for all use cases.
The changes in this PR include:

• Addition of affinity field for spec type pod overrides
• Additions of tolerations field for spec type pod overrides

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Documentation

• the change is mentioned in the ## [Unreleased] section of CHANGELOG.md
• the configuration yaml was changed and the example config in README.adoc was updated
• a usage example was added to README.adoc
• tests for the changes have been implemented (see: Testing your changes)

[PasinduDissMrYum]

Hey @d-rk could I please get an approval to run the workflow 🙏

[d-rk]

@PasinduDissMrYum sorry for the delay. I'm quite busy before my vacation here. I cannot promise you that I am able to review you PR before my vacation. So please be patient, it is on my list.
Regarding your PR workflow run: you have to rebase your branch on the latest main branch, otherwise ITs won't work at all.

[d-rk]

@PasinduDissMrYum thank you for the PR, I made some adjustments and the code is now ready to merge.

[PasinduDissMrYum]

Thank you @d-rk!!