[yashjawale]

Adds pre_get_lastpostdate filter to allow short-circuiting expensive queries along with its test cases.
Copies the approach of existing pre_get_lastpostmodified filter.

Trac ticket: https://core.trac.wordpress.org/ticket/63614

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Opus 5.5
Used for: Initial code skeleton and test cases, tweaked & reviewed manually.

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