cpp/memory-may-not-be-freed is not in security-and-quality suite

**Description of the issue**

The rule cpp/memory-may-not-be-freed in [cpp/ql/src/Critical/MemoryMayNotBeFreed.ql](https://github.com/github/codeql/blob/fefc02d65052619e13dc245c1db219b1b0897d99/cpp/ql/src/Critical/MemoryMayNotBeFreed.ql) (and many other rules in the same directory) is not in the security-and-quality suite.

This is surprising as it is in the Critical/ directory and detects an important kind of security vulnerability. I would expect it in the security-extended or security-and-quality suite.

cpp/memory-may-not-be-freed lacks the property `@precision`. I believe that is the reason why it is not selected in security-and-quality suite.
https://github.com/github/codeql/blob/fefc02d65052619e13dc245c1db219b1b0897d99/misc/suite-helpers/security-and-quality-selectors.yml#L1-L16

Read cpp/ql/src/Critical/MemoryMayNotBeFreed.ql and misc/suite-helpers/security-and-quality-selectors.yml, especially the selector entries linked in the issue. Confirm how the missing @precision property affects suite selection, then verify that the rule is included in the security-and-quality suite when the issue is resolved.

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