docs: add volcano plugin guides

[hemantch01]

• The commit message follows our guidelines

• What kind of change does this PR introduce? /kind documentation

• What this PR does / why we need it:
  This PR finalizes and adds the missing user guides for the core Volcano scheduling plugins (Binpack, NodeOrder, Predicates, Priority, SLA, and TDM). All guides follow the standard maintainer frontmatter and structure, and have been locally verified on a Minikube cluster.

• Which issue(s) this PR fixes:
  Fixes [Docs] Missing User Guides for core scheduling plugins (Binpack, NodeOrder, Priority, etc.) #498

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive set of user guides for various Volcano scheduler plugins, including Binpack, DRF, Gang, NodeOrder, Predicates, Priority, Proportion, SLA, and TDM. The review feedback identifies configuration errors in the Gang plugin documentation regarding argument nesting and naming, and highlights the missing 'preempt' action in the TDM plugin's scheduler configuration example.

[gemini-code-assist]

The configuration for the gang plugin is missing the arguments key. In Volcano, plugin-specific configurations must be nested under arguments. Additionally, the standard argument name for controlling preemption in the gang plugin is gang.preemptable rather than enablePreemptable.

Suggested change

	- name: gang
	enablePreemptable: false
	- name: gang
	arguments:
	gang.preemptable: false

[gemini-code-assist]

The preempt action is missing from the actions list. The TDM plugin relies on the preempt action to trigger the eviction of workloads when the time window expires, as described in the Verification section.

Suggested change

	actions: "enqueue, allocate, backfill"
	actions: "enqueue, allocate, preempt, backfill"

[JesseStutler]

Thanks for your great work, but I prefer not to put plugins related docs under user guide, but to set the plugin as the second menu and then put all plugin related docs into it. We can first wait until #493 merged and then continue refactoring