add exit to builtins

[nggit]

Before:

import sys

if True:
    sys.exit()

After:

if True:
    exit()

Although exit is almost always available in regular Python, this change is to ensure it is always there.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud