docs: add the disabled ITS context

* Add the disabled context to the list of available
  IntegrationTestScenario contexts

Signed-off-by: dirgim <[email protected]>

rh-pre-commit.version: 2.2.0
rh-pre-commit.check-secrets: ENABLED

Author: dirgim

docs/modules/ROOT/pages/how-tos/testing/integration/choosing-contexts.adoc

@@ -13,6 +13,9 @@ The full list of supported contexts is:
 * “push” - runs the integration test in case of the Snapshot being created for a `push` event
 * "override” - runs the integration test for an `override`  Snapshot
 ** See more in xref:how-tos/testing/integration/override-snapshots.adoc[Creating an override snapshot]
+* "disabled" - disables the execution of the given integration test if it's the only context that's defined
+** This can be useful if the scenario in question needs to only be executed manually, see more about running
+integration tests manually in xref:how-tos/testing/integration/rerunning.adoc[Rerunning an integration test]
 
 +
 NOTE: When multiple contexts are defined, the IntegrationTestScenario will execute if any of the specified contexts match the snapshot. This approach ensures that the test runs as long as at least one context applies, without requiring all defined contexts to be met.