Bug in releasechecker causing release checks to run smoke instead of full test tags

[komish]

When cutting release PRs to production repos, we're seeing this message in the logs that control which set of tests are executed:

PR title indicates PR is not part of a release: 'Workflow and script updates from development repository Release-1.7.5'$'\n'

The bug seems to be here:

development/scripts/src/release/releasechecker.py

Lines 156 to 159 in 046300b

	if not pr_body.startswith(releaser.CHARTS_PR_BRANCH_BODY_PREFIX):
	print(f"PR title indicates PR is not part of a release: {pr_body}")
	return False

It would seem that what we're evaluating here doesn't align with what's actually being passed in.

Not a huge issue given that releasing involves running E2E tests before these PRs even get cut to stage/charts repositories.