Disable context propagation by default for 2.0

[grcevski]

Since we are preparing for release 2.0 we should disable the new network based context propagation, until we've tested the support more extensively and let people try it on their own terms for a bit.

After some careful consideration I think we need to do couple of more checks before we can enable this by default at all times:

1. We should only enable this if the customer is exporting traces, for metrics this option only adds overhead and doesn't have any useful impact.
2. We need to ensure the TC is working correctly before we can enable this. The main challenge is our header injection at L7, which relies on two components. The sock_msg filter is extending the packet, while TC writes the data. If for various reasons, mainly because of improper chaining of TC we fail to run our TC program, the extension of the header value will break the HTTP protocol.
3. We should test how this behaves with sidecars, which is not a test we currently have. Namely, what happens if each individual sidecar registers a TC for it's interface and the sock message is done at the default host cgroup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.17%. Comparing base (285162b) to head (a4d71b4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1567      +/-   ##
==========================================
+ Coverage   71.15%   71.17%   +0.02%     
==========================================
  Files         197      197              
  Lines       19671    19671              
==========================================
+ Hits        13996    14001       +5     
+ Misses       4995     4993       -2     
+ Partials      680      677       -3     

Flag	Coverage Δ
integration-test	53.12% <ø> (-0.20%)	⬇️
k8s-integration-test	52.74% <ø> (-0.62%)	⬇️
oats-test	32.57% <ø> (-1.68%)	⬇️
unittests	47.33% <ø> (+0.01%)	⬆️

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[rafaelroquetto]

That is fair enough, indeed!

[marevers]

LGTM!