Add support for BMS machines to the resource detection library

[alex-basinov]

This PR adds support for BMS machines to the resource detection library.

I'm planning to upgrade the resource detection processor within the opentelemetry-collector-contrib repository to make use of this new BMS detector, aiming to enable native BMS support in the otel collector.

Due to the absence of a metadata server in the BMS environment, we rely on the presence of BMS_PROJECT_ID, BMS_REGION, and BMS_INSTANCE_ID environment variables as an indication that the collector is running on BMS machines. Customers are expected to manually enter these variables into the Ops Agent's collector using the DefaultEnvironment parameter in the /etc/systemd/system.conf file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.57%. Comparing base (4caace7) to head (f33e99e).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
+ Coverage   61.03%   62.57%   +1.53%     
==========================================
  Files          56       57       +1     
  Lines        5903     4911     -992     
==========================================
- Hits         3603     3073     -530     
+ Misses       2143     1681     -462     
  Partials      157      157              

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