fix: 688 feed page minor UI fixes pre release

[qcdyx]

Summary:

Closes #688

Expected behavior:

1. Transit provider field in feed summary shouldn’t be bulleted when there’s only 1 provider

   

2. Authentication type shouldn't show if type is 0

   

3. Feed contact email shouldn't show a colon at the end

   

4. In cases where a dataset doesn't have a validation report, should show "Validation report not available” in the dataset history row

   

Testing tips:

Provide tips, procedures and sample files on how to test the feature. Testers are invited to follow the tips AND to try anything they deem relevant outside the bounds of the testing tips.

Please make sure these boxes are checked before submitting your pull request - thanks!

• [x] Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• [ ] Add or update any needed documentation to the repo
• [x] Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• [x] Linked all relevant issues
• [x] Include screenshot(s) showing how this pull request works and fixes the issue(s)

[github-actions[bot]]

Preview Firebase Hosting URL: https://mobility-feeds-dev--pr-699-7543h9pe.web.app

[emmambd]

@qcdyx Can we remove the additional space at the end of the transit provider line?

[qcdyx]

@emmambd