Log when Environment Provider tries to pull unset or empty env var

[ankitpatel96]

Description:
Creates a logger in the confmap.ProviderSettings and uses it to log when there is a missing or blank environment variable referenced in config. For now the noop logger is used everywhere except tests.

Link to tracking Issue: 5615

Testing:
I wrote unit tests that ensured

1. logging occurred when an environment variable was unset
2. logging occcured when the env var was empty.
3. there was no log when an env var was used correctly

I also started the otel collector with the sample config - and added an env var reference in the sample config. I then inserted a print statement next to each log call to see whether my code paths were hit in the live application. I then went through the 3 cases mentioned above and ensured that logging behavior was accurate.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ankitpatel96 / name: Ankit Patel (cf33732, bbf17cb, 555b34d, 2019f45, b5be922, 054be18, d917bc3, 8c9660a, c6da796, 22e3404, aac8bc8, 552028a, 63fc22d, 033e975, fc36332, dd0842e, f7f19bb)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (99b367c) to head (dd0842e).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9837      +/-   ##
==========================================
+ Coverage   91.13%   91.32%   +0.19%     
==========================================
  Files         353      357       +4     
  Lines       18735    19179     +444     
==========================================
+ Hits        17074    17516     +442     
- Misses       1333     1335       +2     
  Partials      328      328              

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[mx-psi]

LGTM after rewording the function name and moving to an appropriate place. We may undergo a bit of churn on the confmap code still, so I think it's okay to leave NewNopProviderSettings there until we figure out how the code structure will look like

[evan-bradley]

Looks good to me, thanks for adding this.