Send notifications on bulk event creation

[hmpf]

Scope and purpose

Fixes #1762

This pull request

• adds/changes/removes a dependency
• changes the database
• changes the API

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to Argus can be found in the
Development docs.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation, including updates to the user manual if feature flow or UI is considerably changed
• Linted/formatted the code with ruff and djLint, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See our how-to
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• If this results in changes in the UI: Added screenshots of the before and after
• If this results in changes to the database model: Updated the ER diagram

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test results

    6 files    888 suites   1m 58s ⏱️
  697 tests   696 ✅ 1 💤 0 ❌
4 182 runs  4 176 ✅ 6 💤 0 ❌

Results for commit bcf64ad.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.57%. Comparing base (79c36d3) to head (bcf64ad).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1763      +/-   ##
==========================================
+ Coverage   82.55%   82.57%   +0.02%     
==========================================
  Files         137      137              
  Lines        6552     6561       +9     
==========================================
+ Hits         5409     5418       +9     
  Misses       1143     1143              

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