docs: update dependency-review.yml trigger tables for push trigger

[Jitendra Bansal (Jbansal2)]

Summary

• `dependency-review.yml` was changed in feat(workflows): publish downloadable main SBOM #2994 to also run `on: push` to `main`/`develop` (the `main-sbom` job, plus `dependency-submission` now running on both `push` and `pull_request`).
• Two documentation tables still described its trigger as pull-request-only. Updated both to reflect the push + pull_request triggers.

Fixes #2996

Test plan

• Confirmed current trigger config in `.github/workflows/dependency-review.yml`
• Updated `docs/architecture/workflows.md` orchestration workflows table
• Updated `docs/security/security-model.md` Validation Workflow Coverage table
• Docs-only change; no code/CI behavior affected

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