Reduce various info logs to debug

[Sushisource]

Fixes #
Design discussion issue (if applicable) #2697

Changes

Reduce various recently introduced info level logs to debug.

Many of these are lifecycle related and unlikely to be interesting to most users.

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)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Sushisource / name: Spencer Judge (d7acbc5, bce40dd, 616b2d0)

[codecov]

Codecov Report

Attention: Patch coverage is 56.25000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 79.3%. Comparing base (bc5e6ce) to head (616b2d0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/metrics/periodic_reader.rs	22.2%	7 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2700   +/-   ##
=====================================
  Coverage   79.3%   79.3%           
=====================================
  Files        123     123           
  Lines      22657   22657           
=====================================
+ Hits       17970   17974    +4     
+ Misses      4687    4683    -4     

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[cijothomas]

Looks good except one place : https://github.com/open-telemetry/opentelemetry-rust/pull/2700/files#r1966362700
Once this is resolved, we are good to merge.

(Also, there is merge conflict due to changelog. Please resolve that too to merge)