A11y: enable rule jsx-a11y/alt-text (#55832)

* Enable jsx-a11y/alt-text rule

* Fix errors

* Fix tests

* Enable jsx-a11y/alt-text rule after solving merge conflict

* Delete unused import

* Modify files according to the reviewer's comments

* Revert test changes and update snapshot

* tweaks to image alt names

Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

pkg/build/cmd/rpm.go

@@ -291,7 +291,7 @@ func signRPMRepo(repoRoot string, cfg PublishConfig) error {
 		PrimaryKey: pubKey,
 		PrivateKey: privKey,
 		Identities: map[string]*openpgp.Identity{
-			uid.Id: &openpgp.Identity{
+			uid.Id: {
 				Name:   uid.Name,
 				UserId: uid,
 				SelfSignature: &packet.Signature{