Add route to opentelemetry collector at the ingress

[Warashi]

What this PR does / why we need it:

Add a route to the pipecd-gateway for the OpenTelemetry Collector path.

Which issue(s) this PR fixes:

Follows #5016 Fixes #4977

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 22.93%. Comparing base (b4cc0e8) to head (7e5c348). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5187 +/- ## ======================================= Coverage 22.93% 22.93% ======================================= Files 419 419 Lines 44986 44986 ======================================= Hits 10318 10318 Misses 33873 33873 Partials 795 795 ```

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