Adding if Condition for checksum

[vemulaanvesh]

What does this PR do?

• Adding a provision to turn off or on checksum

• When i am applying JCASC via GH PR, every time when PR get merged, Jenkins is througing 111 error for nearly 30-40 sec (which means downtime for 30-40 sec).

• so we want to turn off checksum and restart jenkins during maintaince window.

• As this is a extra provision to users i feel this should be a good option

If you modified files in the ./charts/jenkins/ directory, please also include the following:

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1. I bumped the "version" key in `./charts/jenkins/Chart.yaml`.

   I bumped the "version" key in ./charts/jenkins/Chart.yaml.
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2. I added a new changelog entry to `./charts/jenkins/CHANGELOG.md`.

   I added a new changelog entry to ./charts/jenkins/CHANGELOG.md.
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3. I followed the [technical requirements](https://github.com/jenkinsci/helm-charts/blob/main/CONTRIBUTING.md#technical-requirements).

   I followed the technical requirements.
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4. I ran `.github/helm-docs.sh` from the project root.

   I ran .github/helm-docs.sh from the project root.
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Special notes for your reviewer

[kvanzuijlen]

You put this right in between the Helm docs for initScripts and the initScripts property itself. Also, for it to be compatible with Helm docs, your comment should start with --.

Suggested change

	# -- Map of groovy init scripts to be executed during Jenkins controller start
	# Enable or Disable checksum if we don't want to auto run configmaps
	checksum: true
	initScripts: {}
	# -- Enable or Disable checksum if we don't want to auto run configmaps
	checksum: true
	# -- Map of groovy init scripts to be executed during Jenkins controller start
	initScripts: {}