disable failing GPG integration tests (#4318) (#4335)

(cherry picked from commit afe4a30)

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

Author: mergify[bot]

testing/integration/upgrade_gpg_test.go

@@ -29,6 +29,8 @@ func TestStandaloneUpgradeWithGPGFallback(t *testing.T) {
 		Sudo:  true,  // requires Agent installation
 	})
 
+	t.Skip("Skipped until https://github.com/elastic/elastic-agent/issues/4317 is solved")
+
 	minVersion := upgradetest.Version_8_10_0_SNAPSHOT
 	currentVersion, err := version.ParseVersion(define.Version())
 	require.NoError(t, err)
@@ -93,6 +95,8 @@ func TestStandaloneUpgradeWithGPGFallbackOneRemoteFailing(t *testing.T) {
 		Sudo:  true,  // requires Agent installation
 	})
 
+	t.Skip("Skipped until https://github.com/elastic/elastic-agent/issues/4317 is solved")
+
 	minVersion := upgradetest.Version_8_10_0_SNAPSHOT
 	currentVersion, err := version.ParseVersion(define.Version())
 	require.NoError(t, err)