[GoogleAdWords] Conversion ID client validation

[eduard13]

Description (*)

This PR adds client validation for Conversion ID instead of validating the ID on the backend while configuring the Google AdWords.

Fixed Issues (if relevant)

1. Navigate to Stores / Configuration / Google API [Sales] / Google AdWords
2. Enable Google AdWords
3. Save configs
4. You'll get Conversion Id value is not valid "". Conversion Id should be an integer. error message.

Manual testing scenarios (*)

1. Navigate to Stores / Configuration / Google API [Sales] / Google AdWords
2. Enable Google AdWords
3. The Conversion ID should be validated before submitting the form.

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-6556 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

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[engcom-Foxtrot]

@magento run all tests

[m2-assistant]

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