feat(sdk-*)!: align merge resource behavior with spec

[david-luna]

Which problem is this PR solving?

Aligns SDKs resource merging strategy with the specification:

Fixes #5132

Short description of the changes

• remove config mergeResourcesWithDefault option
• do not merge default resource if one provided in config
• update tests

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Compiled and ran the tests in all packages.

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.12%. Comparing base (4a394cc) to head (93f52c0).
Report is 5 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #5219      +/-   ##
==========================================
- Coverage   93.15%   93.12%   -0.04%     
==========================================
  Files         315      315              
  Lines        8113     8087      -26     
  Branches     1633     1627       -6     
==========================================
- Hits         7558     7531      -27     
- Misses        555      556       +1     

Files with missing lines	Coverage Δ
...imental/packages/opentelemetry-sdk-node/src/sdk.ts	97.35% <ø> (-0.04%)	⬇️
...perimental/packages/sdk-logs/src/LoggerProvider.ts	97.77% <100.00%> (-0.23%)	⬇️
experimental/packages/sdk-logs/src/config.ts	100.00% <ø> (ø)
...elemetry-sdk-trace-base/src/BasicTracerProvider.ts	96.19% <100.00%> (+0.50%)	⬆️
...ackages/opentelemetry-sdk-trace-base/src/config.ts	88.63% <ø> (ø)
packages/sdk-metrics/src/MeterProvider.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

[pichlermarc]

oh, I actually removed all of these tests on main already. I'll open a PR to sync main to next.
It's time again to do so anyway.