[O2B-1497] Adds endpoint for fetching all beam modes from runs table

[graduta]

I have a JIRA ticket

• branch and/or PR name(s) include(s) JIRA ID
• issue has "Fix version" assigned
• issue "Status" is set to "In review"
• PR labels are selected

Notable changes for users:

• N/A

Notable changes for developers:

• BeamModes are currently saved as a dedicated column in runs table
• adds an endpoint for fetching all distinct values from runs
• during YETS25, as part of O2B-1499, beam mode should be extracted in its own entity

Changes made to the database:

• N/A

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.53%. Comparing base (7619d3c) to head (49403e6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/server/controllers/runs.controller.js	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2024      +/-   ##
==========================================
- Coverage   45.68%   45.53%   -0.15%     
==========================================
  Files        1022     1023       +1     
  Lines       17014    17028      +14     
  Branches     3085     3087       +2     
==========================================
- Hits         7773     7754      -19     
- Misses       9241     9274      +33     

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