Revert "chore(w3c): allow colons in datadog tags propagated in tracestate" (backport #4799 to 1.7)

[mabdinur]

Reverts #4741. : should delimit datadog tracestate tags not ~.

Note

When injecting/extracting ddtrace tags from headers = characters should be replaced with ~. This fix will be introduced in a future PR.

[codecov-commenter]

Codecov Report

Merging #4804 (59b5489) into 1.7 (1a308d1) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              1.7    #4804      +/-   ##
==========================================
- Coverage   78.02%   78.02%   -0.01%     
==========================================
  Files         808      808              
  Lines       62053    62053              
==========================================
- Hits        48416    48414       -2     
- Misses      13637    13639       +2     

Impacted Files	Coverage Δ
tests/tracer/test_context.py	100.00% <ø> (ø)
tests/tracer/test_propagation.py	99.39% <ø> (ø)
tests/tracer/test_utils.py	97.26% <ø> (ø)
ddtrace/internal/utils/http.py	91.17% <100.00%> (ø)
ddtrace/propagation/http.py	95.32% <100.00%> (ø)
ddtrace/internal/remoteconfig/worker.py	95.65% <0.00%> (-4.35%)	⬇️
tests/utils.py	90.18% <0.00%> (-0.24%)	⬇️

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