Remove option java_generic_services from proto files

[scrocquesel]

Commit Message: Remove option java_generic_services from proto files
Additional Description: Generic services are deprecated since protoc version 2.4.0 (2010). Protoc plugins that generates code may require that generic services are disabled, so that they can generate their own classes of the same name.
Risk Level: Low
Testing:
Docs Changes:
Release Notes:
Platform Specific Features:
Optional Fixes #25172

[repokitteh-read-only]

Hi @scrocquesel, welcome and thank you for your contribution.

We will try to review your Pull Request as quickly as possible.

In the meantime, please take a look at the contribution guidelines if you have not done so already.

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Caused by: #25298 was opened by scrocquesel.

see: more, trace.

[repokitteh-read-only]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy[\w/]*/(v1alpha\d?|v1|v2alpha\d?|v2))|(api/envoy/type/(matcher/)?\w+.proto).
CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @markdroth
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #25298 was opened by scrocquesel.

see: more, trace.

[htuch]

Will need to update https://github.com/envoyproxy/envoy/blob/main/tools/protoprint/protoprint.py. @phlax since you responded to the original issue, do you want to take this PR?

[phlax]

@scrocquesel thanks for raising this

i think these 2 lines

envoy/tools/protoprint/protoprint.py

Lines 244 to 245 in eb49336

	if file_proto.service:
	options.java_generic_services = True

need to be removed

it might also need to be removed from tools/testdata/protoxform/envoy/v2/discovery_service.proto.active_or_frozen.gold

[phlax]

(as a side point - its generally better not to force push unless there is a reason - ie use merge over rebase and separate commits etc - it doesnt matter so much at this point - but its generally frowned upon)

[scrocquesel]

@phlax Yes, I have only searched the directive in proto files.

[phlax]

/retest

[phlax]

/retest

[repokitteh-read-only]

Retrying Azure Pipelines:

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Caused by: a #25298 (comment) was created by @phlax.

see: more, trace.

[phlax]

lgtm, thanks @scrocquesel

cc @htuch @adisuissa for final api stamp