deprecate obsreport.Must functions in favor of obsreport.New

[paivagustavo]

Description: Deprecate obsreport.Must* functions, make deprecated obsreport.New* functions to return an error and undeprecate them.

The ScraperControllerReceiver was changed to created a obsreport.Scraper for each configured scraper during the NewScraperControllerReceiver instead of creating a new obsreport.Scraper every scrape.

Link to tracking Issue: #6458

[codecov]

Codecov Report

Base: 91.66% // Head: 91.36% // Decreases project coverage by -0.29% ⚠️

Coverage data is based on head (0e19c73) compared to base (226dc13).
Patch coverage: 60.29% of modified lines in pull request are covered.

❗ Current head 0e19c73 differs from pull request most recent head f4ef94f. Consider uploading reports for the commit f4ef94f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6510      +/-   ##
==========================================
- Coverage   91.66%   91.36%   -0.30%     
==========================================
  Files         240      240              
  Lines       13815    13875      +60     
==========================================
+ Hits        12663    12677      +14     
- Misses        921      955      +34     
- Partials      231      243      +12     

Impacted Files	Coverage Δ
obsreport/obsreport_processor.go	90.67% <28.57%> (-4.02%)	⬇️
obsreport/obsreport_scraper.go	89.58% <28.57%> (-10.42%)	⬇️
receiver/otlpreceiver/otlp.go	80.24% <40.00%> (-4.42%)	⬇️
exporter/exporterhelper/common.go	90.80% <57.14%> (-3.18%)	⬇️
exporter/exporterhelper/logs.go	80.64% <57.14%> (-4.11%)	⬇️
exporter/exporterhelper/metrics.go	80.64% <57.14%> (-4.11%)	⬇️
exporter/exporterhelper/obsreport.go	94.91% <57.14%> (-5.09%)	⬇️
exporter/exporterhelper/traces.go	80.95% <57.14%> (-4.05%)	⬇️
processor/memorylimiterprocessor/memorylimiter.go	89.63% <62.50%> (-1.37%)	⬇️
obsreport/obsreport_exporter.go	94.59% <66.66%> (+1.83%)	⬆️
... and 9 more

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[bogdandrutu]

@paivagustavo please prepare a PR in contrib to update for the new code. Use make update-otel in contrib repo to upgrade to latest merged PR.