HAI-3593 Fix comma error in attachement file names

[umeetiusbaar]

Description

Encode attachment file name properly so that commas (or other special characters) work.
Add a startup component to fix existing files in Azure Blob Storage.

Jira Issue: https://helsinkisolutionoffice.atlassian.net/browse/HAI-3593

Type of change

• Bug fix
• New feature
• Other

Instructions for testing

Testing new attachments:

1. Create or open a Hanke or an Application
2. Add attachment with e.g. a comma in the file name
3. Try to open the attachment in UI
4. It should work

Testing the fix for existing attachments:

1. Use dev branch for the backend
2. Add an attachment with e.g. comma in filename in UI (if you try to open it, it should fail)
3. Restart the backend with this branch using env variable HAITATON_ATTACHMENT_NAME_FIX_ENABLED=true (default is false)
4. In startup the files should be fixed in Azure Blob Storage
5. Try to open the attachment that failed in step 2 in UI - it should work now

Checklist:

• I have written new tests (if applicable)
• I have ran the tests myself (if applicable)
• I have made necessary changes to the documentation, link to confluence
  or other location:

[github-actions]

Test Results

  413 files      1 errors  412 suites   2m 52s ⏱️
2 574 tests 2 574 ✅ 0 💤 0 ❌
2 825 runs  2 825 ✅ 0 💤 0 ❌

For more details on these parsing errors, see this check.

Results for commit 7086461.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.1% Coverage on New Code
1.6% Duplication on New Code

See analysis details on SonarQube Cloud