SC2164: suppress when cd is the final command in a function

[notpeter]

Fixes: #2474

When cd is the last command in a function,

#!/bin/bash

foo() {
  cd /abc
}

Shellcheck currently triggers SC2164 and suggest using cd /abc || return even though that is no safer than the existing code.

AI disclosure: I used Codex to assist in implementing this PR.

[koalaman]

Definitely a valid complaint, but the added test does not pass

[notpeter]

Adjusted so prop_checkUncheckedCdInFunction1 test case passes and this no longer warns:

#!/bin/bash
foo() {
  cd /abc
}

[koalaman]

Thanks!