opamp bridge configmap: use manifestutils.Labels() logic to set version label

[kristinapathak]

Description:

Fixing a bug where the version label for the opamp bridge config map is too long. We had custom logic for the config map that was overriding the version label being set by manifestutils.Labels():

opentelemetry-operator/internal/manifests/manifestutils/labels.go

Lines 52 to 65 in be172d9

	version := strings.Split(image, ":")
	for _, v := range version {
	if strings.HasSuffix(v, "@sha256") {
	versionLabel = strings.TrimSuffix(v, "@sha256")
	}
	}
	switch lenVersion := len(version); lenVersion {
	case 3:
	base["app.kubernetes.io/version"] = versionLabel
	case 2:
	base["app.kubernetes.io/version"] = naming.Truncate("%s", 63, version[len(version)-1])
	default:
	base["app.kubernetes.io/version"] = "latest"
	}

I removed the custom logic and added a unit test for this use case.

Link to tracking Issue(s):

• Resolves: Operator errors when opamp bridge image is pinned to a specific sha #2583

Testing:
I refactored the unit tests a bit to include this use case and make the test table driven.

Documentation:
None

[swiatekm]

LGTM