Safer endpoint Uri construction

[jaymell]

Make endpoint Uri construction less fragile by stripping out duplicate slashes.

Fixes #997

Changes

The functionality to append the signal path to a user-supplied tracing endpoint is already in place. However, it does so in a way that is likely to break for any user who's passing the string value of a Uri or Url, which will have a trailing slash appended to them. This attempts to fix that issue.

There were other possible changes discussed but ever implemented/merged in #1056. This PR attempts to keep it simple by just changing existing behavior to not break in a common use case.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1be83bb) 65.8% compared to head (2caa7b1) 65.8%.

❗ Current head 2caa7b1 differs from pull request most recent head 2213bfa. Consider uploading reports for the commit 2213bfa to get more accurate results

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1553   +/-   ##
=====================================
  Coverage   65.8%   65.8%           
=====================================
  Files        140     140           
  Lines      19505   19518   +13     
=====================================
+ Hits       12841   12854   +13     
  Misses      6664    6664           

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[hdost]

Thank you for the contribution!