Prepare adding end-to-end tests to the controller go module

[kispaljr]

This PR contains the following end-to-end testing related changes:

• Export end-to-end TestSuite methods as public in order to be usable from other go modules in the future (notable from the porch/controller go module)
• Fix a bug in make run-in-kind that prevented some docker bulid errors to properly propagated to the root make process
• Force the reload of the newly built porch-server and/or porch-controllers pods during make run-in-kind
• test/e2e/cli now explicitly tests the porchctl binary in the .build directory of the current git tree (as opposed to the first one found in PATH)
• Hopefully make the TestFunctionRepository test case less flaky by changing a fix delay to a more flexible wait cycle
• pin the version of the kpt-functions-sdk/go/fn module to prevent future dependency updates to break the code of the imported kpt functions that unfortunately use (the pinned) ancient incompatible version of the SDK

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[liamfallon]

/approve
/lgtm

[liamfallon]

/test presubmit-nephio-go-test

[kispaljr]

/retest

[liamfallon]

/lgtm

[liamfallon]

/approve
/lgtm

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kispaljr, liamfallon

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