ddtrace/tracer: update the tag naming convention for otel env var telemetry metrics

[khanayan123]

What does this PR do?

Updates the tag naming convention for otel env var telemetry metrics

Motivation

Update tag naming convention based on update to otel env var mapping RFC

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-06-27 15:17:21

Comparing candidate commit 0ab5295f349af0725deb4d0fdd746917eefd3c88 in PR branch khanayan123/update-otel-env-metric-tag-names with baseline commit 27d60deb6d8f2a2f6e60bf4d6fe3690fd3f93d85 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 46 metrics, 1 unstable metrics.