Make datadog distributed tracing header take priority over tracecontext

[Qard]

What does this PR do?

Makes the datadog distributed tracing headers take priority over w3c tracecontext.

Motivation

Some cloud providers such as GCP inject their own traceparent headers between services, altering the parentage without reporting that parentage data between them. This results in a break in the connection between the two ends of the request the distributed tracing headers are supposed to link.

[github-actions]

Overall package size

Self size: 4.9 MB
Deduped: 58 MB
No deduping: 58.09 MB

Dependency sizes

name	version	self size	total size
@datadog/native-iast-taint-tracking	1.5.0	14.86 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
@datadog/pprof	3.1.0	10.66 MB	11.5 MB
protobufjs	7.2.4	2.74 MB	6.52 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@opentelemetry/core	1.14.0	872.87 kB	1.47 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.4.1	780.32 kB	780.32 kB
msgpack-lite	0.1.26	201.16 kB	281.59 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.3	93.39 kB	123.79 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ipaddr.js	2.0.1	59.52 kB	59.52 kB
int64-buffer	0.1.10	49.18 kB	49.18 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 kB
module-details-from-path	1.0.3	4.47 kB	4.47 kB

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Merging #3414 (9d0a589) into master (3cd0704) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3414   +/-   ##
=======================================
  Coverage   84.27%   84.27%           
=======================================
  Files         214      214           
  Lines        8398     8398           
  Branches       33       33           
=======================================
  Hits         7077     7077           
  Misses       1321     1321           

Impacted Files	Coverage Δ
packages/dd-trace/src/config.js	99.10% <100.00%> (ø)

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