Revise trac.torproject.org urls to refer to gitlab replacements.

changes/ticket40101

doc/HACKING/CircuitPaddingDevelopment.md

doc/HACKING/CircuitPaddingQuickStart.md

doc/HACKING/Fuzzing.md

doc/HACKING/GettingStarted.md

doc/HACKING/ReleasingTor.md

doc/TUNING

doc/man/tor.1.txt

src/app/config/app_config.md

src/app/config/config.c

src/core/or/circuitbuild.c

src/core/or/circuitlist.c

src/feature/relay/relay_config.c

src/feature/relay/router.c

src/lib/string/compat_string.h

src/test/test_options.c