[V2] Clean up utils file

[rquitales]

Proposed changes

This PR removes the custom min and max functions for the time.Duration type. Go v1.21 introduced built-in functions so we can rely on them. This PR also adds a simple test case for the existing exactlyOneOf function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.37%. Comparing base (096b846) to head (d0d0956).
Report is 1 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #708      +/-   ##
==========================================
+ Coverage   49.23%   49.37%   +0.13%     
==========================================
  Files          26       26              
  Lines        2890     2882       -8     
==========================================
  Hits         1423     1423              
+ Misses       1290     1284       -6     
+ Partials      177      175       -2     

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[EronWright]

Were the min/max functions not being used in the stack controller?

[rquitales]

Were the min/max functions not being used in the stack controller?

min and max are used in the reconcile function to determine the requeue after time:

pulumi-kubernetes-operator/operator/internal/controller/pulumi/stack_controller.go

Lines 705 to 713 in 096b846

	requeueAfter = max(1*time.Second, time.Until(instance.Status.LastUpdate.LastResyncTime.Add(resyncFreq)))
	}
	if stack.GitSource != nil {
	trackBranch := len(stack.GitSource.Branch) > 0
	if trackBranch {
	// Reconcile every resyncFreq to check for new commits to the branch.
	pollFreq := resyncFreq
	log.Info("Commit hash unchanged. Will poll for new commits.", "pollFrequency", pollFreq)
	requeueAfter = min(requeueAfter, pollFreq)