Add exclude from Search checkbox to pages and posts

[amesplant]

Description of the Change

Add Exclude from Search Checkbox in the sidebar

Alternate Designs

None that I am aware of

Benefits

Allows the user to indicate this page should be excluded from the search results

Possible Drawbacks

current version only available in Gutenberg

Verification Process

• checked that the meta attribute for 'exclude_from_search' was false on initial load wp.data.select('core/editor').getEditedPostAttribute('meta') which returned {exclude_from_search: false}
• selected 'exclude_from_search', published the post / page and checked to make sure that this time {exclude_from_search: false} was returned.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

Changelog Entry

[tlovett1]

Hey @amesplant I think you or someone else will also need to tie this to the query integration such that posts are actually excluded.

[felipeelia]

Closing as this feature was introduced in EP 4.4.0 via #3100.