feature-8832: Add option "Not sure yet" to attendee Form Yes/No quest…

[khangon]

…ions

Fixes #8832

Short description of what this resolves:

• Add option "Not sure yet" to attendee Form Yes/No questions

Changes proposed in this pull request:

• In the attendee forms, the Yes/No questions only have the option to answer Yes or No. Please add the option "Not sure yet" as a third answer option to the Yes/No question.

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
open-event-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2023 7:21am

[khangon]

Hi @norbusan, @cweitat
As expected, I have added the "Not sure yet" option for Yes/No question types.
Please help me check and verify.
Thanks