build: merge TrackMemory (CURLDEBUG) into debug-enabled option

Drop separate `TrackMemory` (aka `CURLDEBUG`) debug feature.

After recent changes (thread-safety,
193cb00ce9, and updates leading up to
it), `TrackMemory` is unlikely to cause build or runtime issues.

To simplify builds and debug options, enable `TrackMemory`
unconditionally for debug-enabled (aka `DEBUGBUILD`) builds. Before
this patch, this was already the default, with an option to disable
it, or enable it in non-debug-enabled builds.

Note, in practice these two debug options already went hand in hand. It
was not possible to toggle them separately for a long time due to bugs,
before 59dc9f7e69 (2024-05-28) fixed it.

This patch also removes/deprecates separate knobs and feature flags for
`TrackMemory`:
- autotools: `--enable-curldebug`/`--disable-curldebug`
- cmake: `-DENABLE_CURLDEBUG=ON`/`OFF`
- C macro: `CURLDEBUG`
- libcurl: `CURL_VERSION_CURLDEBUG` symbol deprecated in favor
  of `CURL_VERSION_DEBUG`. They always return the same value after this
  patch.

Also:
- drop `TrackMemory` from `curl -V` output.
- rename internal `CURLDEBUG` macro to `CURL_MEMDEBUG` internally.
  To avoid confusion with `DEBUGBUILD`, but to keep guarding
  `TrackMemory`-related internals for readability.
- runtests: bind `TrackMemory` to debug feature. Keep it a separate
  test feature requirement, for clarity.
- CI: drop test builds for combinations of the two options.
- GHA/linux: no longer disable TrackMemory in the TSAN job.

Ref: https://github.com/curl/curl/pull/20328#issuecomment-3754528407

Closes #20331

lib/curl_addrinfo.c

@@ -485,7 +485,7 @@ struct Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath,
 }
 #endif
 
-#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) &&  \
+#if defined(CURL_MEMDEBUG) && defined(HAVE_GETADDRINFO) &&  \
   defined(HAVE_FREEADDRINFO)
 /*
  * curl_dbg_freeaddrinfo()
@@ -515,9 +515,9 @@ void curl_dbg_freeaddrinfo(struct addrinfo *freethis,
   freeaddrinfo(freethis);
 #endif
 }
-#endif /* CURLDEBUG && HAVE_FREEADDRINFO */
+#endif /* CURL_MEMDEBUG && HAVE_FREEADDRINFO */
 
-#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO)
+#if defined(CURL_MEMDEBUG) && defined(HAVE_GETADDRINFO)
 /*
  * curl_dbg_getaddrinfo()
  *
@@ -553,7 +553,7 @@ int curl_dbg_getaddrinfo(const char *hostname,
     curl_dbg_log("ADDR %s:%d getaddrinfo() failed\n", source, line);
   return res;
 }
-#endif /* CURLDEBUG && HAVE_GETADDRINFO */
+#endif /* CURL_MEMDEBUG && HAVE_GETADDRINFO */
 
 #if defined(HAVE_GETADDRINFO) && defined(USE_RESOLVE_ON_IPS)
 /*