[NFC][analyzer] OOB test consolidation III: 'outofbound' tests (#128508)

Before commit 6e17ed9 the test files `outofbound.c` and
`outofbound-notwork.c` tested the behavior of the old alpha checker
`alpha.security.ArrayBound` (V1); then that commit converted them into
tests for the checker `security.ArrayBound` which was previously called
`alpha.security.ArrayBoundV2`.

This commit removes these test files and migrates their useful content
to `out-of-bounds.c`. The file `outofbound.c` contained lots of
testcases that covered features which are also covered in
`out-of-bounds.c` or `out-of-bounds-diagnostics.c`; those redundant
cases are discarded during this migration process.

This is part of a commit series that reorganizes the tests of
`security.ArrayBound` to a system that's easier to understand and
maintain.

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