Fix: Associate labels with input fields of File and Checkbox Widget

[Abhishek-17h]

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Closes #6341

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[Abhishek-17h]

@stevepiercy @JeffersonBledsoe @davisagli Please provide review.

[stevepiercy]

News looks good, with a minor tweak.

This is ready for a technical review.

[stevepiercy]

News approved. Still needs technical review. Thanks for your work!

[ichim-david]

@Abhishek-17h Modify the tests to have a different id from one test to the other so that we don't have my-field id duplication.
Then have a look at why the label My field points to the same for="field-my-field"
https://github.com/plone/volto/pull/6592/files#diff-9f7a0caef8d93ad615d7038488525d38b67b32b86153f7441bc973f60b06f713R188

[Abhishek-17h]

@ichim-david I’ve modified the tests to ensure each ID is unique, avoiding any duplication issues. Also I’ve verified that the label now correctly points to the associated for attribute (for="field-unique-id") in each test scenario.
Please have a look.