GS/TC: Further check and resize valids instead of deleting the target.

[lightningterror]

Description of Changes

GS/TC: Further check and resize valids instead of deleting the target.

Rationale behind Changes

Follow up from https://github.com/PCSX2/pcsx2/pull/13119 Future proof potential bug fixes.

Suggested Testing Steps

Test variety of games, see if I broke anything, especially crashes.

Did you use AI to help find, test, or implement this issue or feature?

No.