Delimit content types in a readable format

[jazairi]

Why these changes are being introduced:

The record view does not join the content type field on a character,
so multiple content types are displayed in an unreadable format.

Relevant ticket(s):

https://mitlibraries.atlassian.net/browse/RDI-242

How this addresses that need:

This joins the content type field on a semicolon to render it
the same as the result view.

Side effects of this change:

None.

Developer

• All new ENV is documented in README
• All new ENV has been added to Heroku Pipeline, Staging and Prod
• ANDI or Wave has been run in accordance to
  our guide and
  all issues introduced by these changes have been resolved or opened as new
  issues (link to those issues in the Pull Request details above)
• Stakeholder approval has been confirmed (or is not needed)

Code Reviewer

• The commit message is clear and follows our guidelines
  (not just this pull request message)
• There are appropriate tests covering any new functionality
• The documentation has been updated or is unnecessary
• The changes have been verified
• New dependencies are appropriate or there were no changes

Requires database migrations?

NO

Includes new or updated dependencies?

NO

[coveralls]

Pull Request Test Coverage Report for Build bd10cfba2f5d37043b8b51360649187e15e52769-PR-70

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.42%

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Totals
Change from base Build 41719d2afe149ed79ad511ec19f96f73aed98505:	0.0%
Covered Lines:	343
Relevant Lines:	345

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💛 - Coveralls