Remove regex support from sampling rules

[PROFeNoM]

Description

AIT-9144

As part of extended sampling, we now support only glob pattern matching. 

We still allow regexes and added a config knob to allow glob matching DD_TRACE_SAMPLING_RULES_FORMAT

We should drop both support for regexes and this config knob.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-21 14:06:55

Comparing candidate commit ead89b8 in PR branch alex/major/regex-sampling with baseline commit b25dc1e in branch master.

Found 9 performance improvements and 0 performance regressions! Performance is the same for 173 metrics, 0 unstable metrics.

scenario:SamplingRuleMatchingBench/benchGlobMatching1

• 🟩 execution_time [-194.616ns; -81.984ns] or [-7.780%; -3.277%]

scenario:SamplingRuleMatchingBench/benchGlobMatching1-opcache

• 🟩 execution_time [-165.706ns; -81.294ns] or [-6.524%; -3.201%]

scenario:SamplingRuleMatchingBench/benchGlobMatching2

• 🟩 execution_time [-223.371ns; -118.629ns] or [-8.532%; -4.531%]

scenario:SamplingRuleMatchingBench/benchGlobMatching2-opcache

• 🟩 execution_time [-217.386ns; -101.614ns] or [-8.125%; -3.798%]

scenario:SamplingRuleMatchingBench/benchGlobMatching3

• 🟩 execution_time [-258.360ns; -117.240ns] or [-9.290%; -4.216%]

scenario:SamplingRuleMatchingBench/benchGlobMatching3-opcache

• 🟩 execution_time [-196.241ns; -98.559ns] or [-7.076%; -3.554%]

scenario:SamplingRuleMatchingBench/benchGlobMatching4

• 🟩 execution_time [-178.233ns; -71.767ns] or [-6.776%; -2.728%]

scenario:SamplingRuleMatchingBench/benchGlobMatching4-opcache

• 🟩 execution_time [-203.352ns; -100.848ns] or [-7.575%; -3.757%]

scenario:SamplingRuleMatchingBench/benchRegexMatching4

• 🟩 execution_time [-372.664ns; -166.136ns] or [-6.008%; -2.678%]