🔊 [RUMF-1467] Enable customer data telemetry

[amortemousque]

Motivation

Enable customer data telemetry

Changes

Remove feature flag: customer_data_telemetry

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1983 (2a510f6) into main (1ab2229) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1983      +/-   ##
==========================================
- Coverage   93.38%   93.37%   -0.01%     
==========================================
  Files         144      144              
  Lines        5484     5482       -2     
  Branches     1245     1243       -2     
==========================================
- Hits         5121     5119       -2     
  Misses        363      363              

Impacted Files	Coverage Δ
.../rum-core/src/domain/startCustomerDataTelemetry.ts	100.00% <100.00%> (ø)

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