[BAM-15536] Branches are created/triggered even with Plan disabled

create application link between Bamboo v5.7.2 and Stash v3.6.0
create a repository in Stash
commit something to the repository
create a Project / Plan in Bamboo
set up Stash repository in "Plan configuration >> Repositories" tab
under "Plan configuration >> Triggers" tab, select "Stash repository triggers the build when changes are committed" as "Trigger type"
under "Plan configuration >> Branches" tab, enable "Create plan branches for branches detected in the repository"
run your build
disable your build Plan
create a new Branch
```
git checkout -b newbranch
```
commit something to the "newbranch"

You will notice a new branch will be displayed under the Plan in Bamboo and the same will trigger a build.

is related to

BAM-12833 Provide mechanism to disable main plan but allow branches to run

relates to

BAM-13084 I disabled a plan and plan branches were still being run on commit

BAM-16094 Branches still added when plan is disabled

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