[FEA] deprecate batch lp in 26.04

[tmckayus]

Deprecate LP batch solve in 26.04. It is unused and runs concurrent LPs in multiple C++ threads, which could be done independently in a user program

[anandhkb]

Addressed by #915
@tmckayus @rgsl888prabhu @Iroy30 for PR review

[github-actions]

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[github-actions]

🔔 Hi @anandhkb @kaatish, this issue has had no activity for 21 days. Please update or let us know if it can be closed. Thank you!

If this is an "epic" issue, then please add the "epic" label to this issue.
If it is a PR and not ready for review, then please convert this to draft.
If you just want to switch off this notification, then use the "skip inactivity reminder" label.