Add lockmanager tag to PostgresMarathon LWLock:LockManager posts

[NikolayS]

Summary

Adds a unified lockmanager tag to the PostgresMarathon 2 blog posts that explore LWLock:LockManager, so they can be grouped together via a single tag.

Tagged posts:

• 2-001: Lightweight and heavyweight locks
• 2-002: Relation-level locks
• 2-003: The roots of LWLock:LockManager
• 2-004: Fast-path locking explained
• 2-005: More LWLock:LockManager benchmarks for Postgres 18
• 2-006: Mysterious max_locks_per_transaction (the example from the request)
• 2-007: Should we worry about pg_blocking_pids()'s observer effect?
• 2-008: LWLock:LockManager and prepared statements
• 2-009: Prepared statements and partitioned table lock explosion, part 1
• 2-010: Prepared statements and partitioned table lock explosion, part 2
• 2-011: Prepared statements and partitioned tables — the paradox, part 3

Skipped 2-012 (pgBackRest replica creation) and 2-013 (indexes), which are not about LockManager.

Test plan

• Verify the lockmanager tag page lists all 11 posts after build
• Confirm no other frontmatter or rendering regressed

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