R4.2

R4-2: Changes since R4-1

• Improve caPutJsonLog support, including fixes to string comparisons.
• Remove Base 3.14–specific code. As of caPutLog R4.1, Base 3.14 is no longer supported due to the use of epicsAtomic.
• Update GitHub Actions workflow and configuration.
• Prevent certain commands from being called before caPutLog initialization.
• Improve and fix caPutJsonLog tests.
• Increase the maximum hostname length.
• Remove unused variables.