Upgrade pdata to proto to 1.4.0

[dmathieu]

This upgrades pdata to the 1.4.0 version of protobufs.

Sorry for the very large PR. This can't really be split into smaller PRs though, as changes are not backwards compatible.

This PR includes #11706, as the two are very close and separating them would cause weird conflicts.
The two changes can be merged either as separate PRs (with 11706 first), or as one.

Closes #11720

cc @mx-psi

[codecov]

Codecov Report

Attention: Patch coverage is 93.99478% with 23 lines in your changes missing coverage. Please review.

Project coverage is 91.55%. Comparing base (c9f8e8b) to head (3306d59).

Files with missing lines	Patch %	Lines
pdata/pprofile/json.go	85.18%	8 Missing ⚠️
pdata/internal/generated_wrapper_int32slice.go	50.00%	6 Missing ⚠️
pdata/internal/generated_wrapper_intslice.go	50.00%	6 Missing ⚠️
pdata/pprofile/profile.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11722      +/-   ##
==========================================
- Coverage   91.63%   91.55%   -0.09%     
==========================================
  Files         442      446       +4     
  Lines       23776    23726      -50     
==========================================
- Hits        21787    21722      -65     
- Misses       1618     1633      +15     
  Partials      371      371              

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[mx-psi]

Is there any way we can make a graceful transition for avoiding this breakage in contrib?

=== FAIL: .  (0.00s)
FAIL	github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/otlpencodingextension [build failed]

=== Errors
Error: ./extension_test.go:205:6: im.SetStartTime undefined (type pprofile.Profile has no field or method SetStartTime)
Error: ./extension_test.go:206:6: im.SetEndTime undefined (type pprofile.Profile has no field or method SetEndTime)

[dmathieu]

I can bring back StartTime, with TimeNanos as the origin field name. But I can't bring back EndTime, as Duration doesn't have the same meaning.

[dmathieu]

I have made EndTime a noop.

[mx-psi]

This PR includes #11706, as the two are very close and separating them would cause weird conflicts.

Should we close #11706 then?

[dmathieu]

It really depends how reviews go. If you prefer reviewing a single but bigger PR, then yes.