Update narrative sanitizer for potentially dangerous content

[feordin]

Description

Improves checking the FHIR resource narrative for potentially dangerous content.
The following types of links inside an href property will be considered 'active' content, and not allowed:
"javascript:",
"vbscript:",
"data:",
"livescript:",
"file:",
"blob:",
"ftp:",
"ms-its:",
"mhtml:",
"jar:",
Any FHIR resource with these as part of an href property in the narrative will not pass validation and be rejected by the service.

Related issues

Addresses [issue AB#186387].

Testing

Additional unit tests were added. Manually tried US Core 6.1.0 to ensure no regression in loading the IG.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• When changing or adding behavior, if your code modifies the system design or changes design assumptions, please create and include an ADR.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@5350419). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5468   +/-   ##
=======================================
  Coverage        ?   76.90%           
=======================================
  Files           ?      976           
  Lines           ?    35614           
  Branches        ?     5355           
=======================================
  Hits            ?    27388           
  Misses          ?     6894           
  Partials        ?     1332           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.