[Cloud Run] Split up In-Process docs

[nhulston]

What does this PR do? What is the motivation?

• Rewrite container in-process docs by breaking them up into a unique page for each runtime
• Use shortcodes to avoid duplicated content
• Break docs into logical steps: (1) install tracer, (2) install agent, (3) setup logs, and (4) configure
• Simplified the instrumentation instructions as much as possible, while still verifying they work. All my test apps that I used to verify these docs can be found in Add In-Process Sample Apps serverless-gcp-sample-apps#5

https://datadoghq.atlassian.net/browse/SVLS-7302

Merge instructions

Merge readiness:

• Ready for merge

Additional notes

Will get to Sidecar Containers in a future PR. Then, Gen 2 functions

[github-actions]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/dotnet
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/go
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/java
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/nodejs
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/php
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/python
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/in_process/ruby

Removed or renamed files (these should redirect)

• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers_in_process

Renamed files

• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/
• https://docs-staging.datadoghq.com/nicholas.hulston/gcr-split-up-in-process-docs/serverless/google_cloud_run/containers/sidecar/

[apiarian-datadog]

i like that we're pulling the language docs apart. is this the standard way to do it in the docs repo?

i do have some concerns about the serverless init setup docs and the environment variables, though.

[nhulston]

i like that we're pulling the language docs apart. is this the standard way to do it in the docs repo?

@apiarian-datadog
Yes, I was inspired by this page: https://docs.datadoghq.com/tracing/trace_collection/automatic_instrumentation/dd_libraries/python/

[rtrieu]

Created a DOCS card for a more in-depth review.

[apiarian-datadog]

do we have public sample apps we can link to?

[nhulston]

I thought we decided not to link to sample apps? I will ask Piyali

[nhulston]

Okay got confirmation, we can link them!

[apiarian-datadog]

looking good.

[apiarian-datadog]

should we include some a note in here or somewhere else about the service label thing in cloud run?

[cswatt]

we can always improve further! but since this PR touches a lot of files and has a high potential of running into merge conflicts if we keep it open much longer, I'd like to merge this and tackle further changes in a new PR.