Allow logout with invalid session

[dblythy]

New Pull Request Checklist

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

Issue Description

Returns "success" for logout call even if associated session is invalid. First commit is failing test to show how users can get stuck not being able to logout if their session becomes invalid.

Related issue: Closes #7277

Approach

TODOs before merging

• Add test cases
• Add entry to changelog

[codecov]

Codecov Report

Merging #7278 (3426a46) into master (a05e9b1) will decrease coverage by 9.31%.
The diff coverage is 100.00%.

❗ Current head 3426a46 differs from pull request most recent head 788dbda. Consider uploading reports for the commit 788dbda to get more accurate results

@@            Coverage Diff             @@
##           master    #7278      +/-   ##
==========================================
- Coverage   93.91%   84.59%   -9.32%     
==========================================
  Files         179      179              
  Lines       13154    13156       +2     
==========================================
- Hits        12353    11129    -1224     
- Misses        801     2027    +1226     

Impacted Files	Coverage Δ
src/middlewares.js	96.74% <100.00%> (-0.44%)	⬇️
...dapters/Storage/Postgres/PostgresStorageAdapter.js	2.47% <0.00%> (-92.90%)	⬇️
src/Adapters/Storage/Postgres/PostgresClient.js	4.76% <0.00%> (-61.91%)	⬇️
src/Controllers/UserController.js	95.27% <0.00%> (-2.37%)	⬇️
src/Controllers/FilesController.js	92.00% <0.00%> (-2.00%)	⬇️
src/batch.js	91.37% <0.00%> (-1.73%)	⬇️
src/Controllers/index.js	96.66% <0.00%> (-1.12%)	⬇️
src/RestWrite.js	93.51% <0.00%> (-0.49%)	⬇️
src/Controllers/SchemaController.js	97.16% <0.00%> (-0.19%)	⬇️
... and 2 more

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[mtrezza]

As commented, this should not be solved on the server side but on the client side in my opinion.