DLPXDOC-6073 Document Concurrent gRPC Thread Behavior Based on CPU Count (docs/5.1.0)

[vimleshmishra]

Summary

• Same content as DLPXDOC-6073 Document Concurrent gRPC Thread Behavior Based on CPU Count #698, targeted directly at the currently-live docs branch (docs/5.1.0) instead of develop, so it publishes to developer.delphix.com immediately on merge — no code release or version bump required, since this is a docs-only addition.
• Adds Concurrent_Plugin_Operations.md under Best Practices, documenting the Delphix Engine's concurrency limit for plugin operations: min(32, <Engine CPUs> + 4).

Context: root cause analysis from ESCL-5693, tracked as a docs task in DLPXDOC-6073.

Why a separate PR from #698

#698 targets develop and only lands in production whenever the next real docs/5.2.0 branch is cut for the 5.2.0 release — timing outside our control. This PR targets docs/5.1.0 directly (the branch developer.delphix.com is serving today), so merging it publishes right away.

Test plan

• pipenv run mkdocs build --clean succeeds locally with no warnings
• Page renders correctly at Best_Practices/Concurrent_Plugin_Operations/ and appears in the left nav after merge

🤖 Generated with Claude Code

[SumoSourabh]

Can you please add screenshot orpublish the changes to your github documentation page for review? Also, lets run linkcheck for new links added.

[vimleshmishra]

Thanks for the review!

Preview: deployed the exact docs/5.1.0-based build (this PR's actual content, not the develop preview from #698) to my fork's GitHub Pages:
https://vimleshmishra.github.io/virtualization-sdk/Best_Practices/Concurrent_Plugin_Operations/

Linkcheck: ran linkcheck -e --skip-file linkcheck-skip.txt against the local build per docs/readme.md — clean:

12408 links
195 destination URLs
0 warnings
0 errors