Story (Required)

As a QE trying to test Pipelines operator I want to check the version of manual approval component by automated test.

Background (Required)

We have a test checking versions of all components shipped with Pipelines operator. Add a test for manual approval which is a new component shipped with 1.15.

https://github.com/openshift-pipelines/release-tests/blob/master/specs/versions.spec#L4-L18
https://github.com/openshift-pipelines/manual-approval-gate/
https://github.com/tektoncd/operator/blob/main/docs/ManualApprovalGate.md

Approach (Required)

1. add a new variable called MANUAL_APPROVAL_VERSION to env/default/default.properties with value v0.2
2. update specs/versions.spec
3. update AssertComponentVersion in pkg/tkn/tkn.go... use command oc get manualapprovalgate manual-approval-gate -o jsonpath={.status.version}
4. verify that the test passes with either 5.0.5 or 1.15 build locally
5. verify that the test passes in acceptance tests pipeline