add check for attribute option values

[torhoehn]

Description (*)

Fixed Issues (if relevant)

1. Attribute text field takes blank values #21504: Attribute text field takes blank values

Manual testing scenarios (*)

1. While configurable product creation now you can't create an attribute option value which only contains a space.
2. While attribute creation now you can't save any attribute if the option value only contains a space.

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]

Hi @torhoehn. Thank you for your contribution
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[dmytro-ch]

Hi @torhoehn, could you please check the automated tests failures?

[torhoehn]

@dmytro-ch Thanks for your review! All tests have passed now.

[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-6236 has been created to process this Pull Request
✳️ @dmytro-ch, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-6349 has been created to process this Pull Request

[engcom-Bravo]

✔️ QA Passed

[m2-assistant]

Hi @torhoehn, thank you for your contribution!
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