Revise caching strategy (PR-8) manual rebase

[liamfallon]

This PR is a manual merge of #8, created to test the performance of the current main branch (and its improvements) against the strategy in PR#8.

This PR is not suggested for merging, rather to try out the solution in PR#8, given that the main branch has moved on too much to make rebasing of PR#8 practical.

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[liamfallon]

/test presubmit-nephio-go-test

[liamfallon]

/test presubmit-nephio-go-test

[liamfallon]

/test presubmit-nephio-go-test

[liamfallon]

/retest

[nephio-prow]

@liamfallon: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
presubmit-nephio-go-test	98115d4	link	true	/test presubmit-nephio-go-test

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