Add parametric system-tests workflow

[vpellan]

What does this PR do?

This PR adds a GitHub workflow for parametrics system-tests

Motivation:

The SCA Env Var system-tests is run as a parametric test, and I wanted to test it on the CI.

Additional Notes:

The FORCE_TESTS env var does not work as the -F option on system-tests only work for the DEFAULT scenario right now.
There are currently 4 tests that needs to be fixed:

• tests/parametric/test_dynamic_configuration.py::TestDynamicConfigSamplingRules::test_trace_sampling_rules_with_tags
• tests/parametric/test_otel_span_methods.py::Test_Otel_Span_Methods::test_otel_span_started_with_link_from_datadog_headers
• tests/parametric/test_otel_span_methods.py::Test_Otel_Span_Methods::test_otel_span_started_with_link_from_w3c_headers
• tests/parametric/test_otel_span_methods.py::Test_Otel_Span_Methods::test_otel_span_started_with_link_from_other_spans

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.11%. Comparing base (eab4b6e) to head (eddd956).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3698   +/-   ##
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  Coverage   98.11%   98.11%           
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  Files        1225     1225           
  Lines       72743    72743           
  Branches     3479     3479           
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  Hits        71369    71369           
  Misses       1374     1374           

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[p-datadog]

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