[otelcol] Add hint about confmap.strictlyTypedInput feature gate

[mx-psi]

Description

Adds coda to errors related to confmap.strictlyTypedInput that direct users to #10552 and explain the feature gate.

Link to tracking issue

Updates #9532

Testing

Tests that the coda is present when there are weakly typed errors and not present with non weakly-typed errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.34%. Comparing base (de8bd27) to head (ce49d23).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10553   +/-   ##
=======================================
  Coverage   92.33%   92.34%           
=======================================
  Files         393      393           
  Lines       18647    18660   +13     
=======================================
+ Hits        17218    17231   +13     
  Misses       1069     1069           
  Partials      360      360           

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[mx-psi]

Using a config similar to that of #9532 (comment) this is the error message:

Error: failed to get config: cannot unmarshal the configuration: 3 error(s) decoding:

* 'service.pipelines[metrics].processors': source data must be an array or slice, got map
* 'service.pipelines[metrics].receivers': source data must be an array or slice, got string
* error decoding 'exporters': error reading configuration for "otlp": 5 error(s) decoding:

* 'headers' expected a map, got 'slice'
* 'keepalive.permit_without_stream' expected type 'bool', got unconvertible type 'int', value: '23'
* 'read_buffer_size' expected type 'int', got unconvertible type 'bool', value: 'true'
* 'tls.insecure' expected type 'bool', got unconvertible type 'string', value: 't'
* 'write_buffer_size' expected type 'int', got unconvertible type 'string', value: '1234'

Hint: Temporarily restore the previous behavior by disabling 
      the `confmap.strictlyTypedInput` feature gate. More details at:
      https://github.com/open-telemetry/opentelemetry-collector/issues/10552

[TylerHelmuth]

nice and detailed, I like it