Implement corpus delete logic

What does this MR do and why?

Adds ability to delete a corpus from the corpus management screen #345089 (closed)

Describe in detail what your merge request does and why.

Screenshots or screen recordings

How to set up and validate locally

Validation errors will be handled in #342583

• From the gitlab repo open a rails console and enable the :corpus_management AND :corpus_management_ui feature flag

bundle exec rails c

then

[4] pry(main)> Feature.enable(:corpus_management)
[4] pry(main)> Feature.enable(:corpus_management_ui)

Navigate to:

http://172.16.123.1:3000/<group>/<project>/-/security/configuration/corpus_management

• Click on New Corpus, upload any zip file

• Click "Add", should see the corpus added to the table

• VERIFY table reloads with corpus

• Click the trashcan item to delete corpus

• VERIFY you see delete modal

• VERIFY confirming in modal reloads the table and deletes the corpus

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #345089 (closed)