BCDA-7446 - update content-type header for OperationOutcome responses to fhir+json

[alex-dzeda]

🎫 Ticket

https://jira.cms.gov/browse/BCDA-7446

🛠 Changes

Changed Content-Type header for OperationOutcome error responses from application/json to application/fhir+json in both v1+v2 of the BCDA API

ℹ️ Context for reviewers

From: https://build.fhir.org/ig/HL7/bulk-data/export.html#response---error-status-1
According to the Bulk FHIR Export IG, OperationOutcome responses should respond with Content-Type of application/fhir+json. This is a one line change that will enhance the conformance of the BCDA application with respect to the bulk FHIR IG.

✅ Acceptance Validation

Unit test on requests.api updated to check for the applicable content-type header in the case of an OperationOutcome response.

🔒 Security Implications

• This PR adds a new software dependency or dependencies.
• This PR modifies or invalidates one or more of our security controls.
• This PR stores or transmits data that was not stored or transmitted before.
• This PR requires additional review of its security implications for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username: StewGoin) as a reviewer and do not merge this PR without his approval.

[codecov-commenter]

Codecov Report

Merging #873 (a9658b1) into master (e047997) will increase coverage by 0.03%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #873      +/-   ##
==========================================
+ Coverage   79.21%   79.24%   +0.03%     
==========================================
  Files          92       92              
  Lines       10435    10436       +1     
==========================================
+ Hits         8266     8270       +4     
+ Misses       1638     1636       -2     
+ Partials      531      530       -1     

Files	Coverage Δ
bcda/responseutils/v2/writer.go	90.07% <100.00%> (+0.03%)	⬆️
bcda/responseutils/writer.go	90.11% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[kyeah]

Looks good, thank you! Can you add the Jira ticket ID in the PR title? :)

[alex-dzeda]

Will be merged for next release; keeping it out of main until there's been at least a few days of commenting on google group post.