refactor: remove restricted session field

[mtrezza]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

The _Session field restricted for the feature of restricted sessions is not in use by Parse Server internally. It is a code artifact of a feature that according to comments has not been ported from Parse.com to Open Source Parse Server.

This is a Parse Server internal field without any internal logic attached to it. The field is unlikely to be used by developers, so instead of deprecating it, we'll remove the field as a sudden breaking change with Parse Server 5.0. If a developer was using the field, the change for a developer would simply be setting the field false in the Session.beforeSave trigger.

See

• Parse-server does not flag manually created session as "restricted" #5047
• Using /sessions endpoint not creating restricted session tokens #6612

Related issue: 6612

Approach

• Remove _Session field restricted from schema
• Remove logic that sets restricted to false by default when creating a new session

TODOs before merging

• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions) --> 📙 Remove any reference to restricted session docs#846

[codecov]

Codecov Report

Merging #7543 (9ceb39b) into master (2783245) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 9ceb39b differs from pull request most recent head 7a2efc2. Consider uploading reports for the commit 7a2efc2 to get more accurate results

@@            Coverage Diff             @@
##           master    #7543      +/-   ##
==========================================
- Coverage   93.96%   93.93%   -0.03%     
==========================================
  Files         181      181              
  Lines       13279    13279              
==========================================
- Hits        12477    12474       -3     
- Misses        802      805       +3     

Impacted Files	Coverage Δ
src/Controllers/SchemaController.js	97.35% <ø> (ø)
src/RestWrite.js	94.10% <ø> (ø)
src/ParseServerRESTController.js	97.01% <0.00%> (-1.50%)	⬇️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	92.47% <0.00%> (-0.65%)	⬇️
src/batch.js	93.10% <0.00%> (+1.72%)	⬆️

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[parseplatformorg]

🎉 This change has been released in version 5.0.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 5.0.0