tests: always make bundles, adapt build and tests

Make test bundles the default. Drop non-bundle build mode.
Also do all the optimizations and tidy-ups this allows, simpler builds,
less bundle exceptions, streamlined build mechanics.

Also rework the init/deinit macro magic for unit tests. The new method
allows using unique init/deinit function names, and calling them with
arguments. This is in turn makes it possible to reduce the use of global
variables.

Note this drop existing build options `-DCURL_TEST_BUNDLES=` from cmake
and `--enable-test-bundles` / `--disable-test-bundles` from autotools.

Also:
- rename test entry functions to have unique names: `test_<testname>`
  This removes the last exception that was handled in the generator.
- fix `make dist` to not miss test sources with test bundles enabled.
- sync and merge `tests/mk-bundle.pl` into `scripts/mk-unity.pl`.
- mk-unity.pl: add `--embed` option and use it when `CURL_CLANG_TIDY=ON`
  to ensure that `clang-tidy` does not miss external test C sources.
  (because `clang-tidy` ignores code that's #included.)
- tests/unit: drop no-op setup/stop functions.
- tests: reduce symbol scopes, global macros, other fixes and tidy-ups.
- tool1621: fix to run, also fix it to pass.
- sockfilt: fix Windows compiler warning in certain unity include order,
  by explicitly including `warnless.h`.

Follow-up to 6897aeb105 #17468

Closes #17590

tests/data/test1306

@@ -22,9 +22,6 @@ internal hash create/add/destroy testing
 <tool>
 unit1305
 </tool>
-<command>
-%TESTNUMBER
-</command>
 </client>
 
 </testcase>

tests/data/test1621

@@ -14,8 +14,6 @@ none
 </server>
 <features>
 unittest
-https
-pop3s
 </features>
 <name>
 unit tests for stripcredentials from URL

tests/data/test2023

@@ -106,7 +106,7 @@ Finally, this is the real page!
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2024

@@ -120,7 +120,7 @@ http
 crypto
 </features>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2025

@@ -203,7 +203,7 @@ SSL
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2026

@@ -156,7 +156,7 @@ http
 crypto
 </features>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2027

@@ -179,7 +179,7 @@ http
 crypto
 </features>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2028

@@ -239,7 +239,7 @@ SSL
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2029

@@ -176,7 +176,7 @@ SSL
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2030

@@ -228,7 +228,7 @@ SSL
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2031

@@ -242,7 +242,7 @@ SSL
 http
 </server>
 <tool>
-libauthretry
+lib2023
 </tool>
 
 <name>

tests/data/test2032

@@ -75,7 +75,7 @@ SSL
 http
 </server>
 <tool>
-libntlmconnect
+lib2032
 </tool>
 
 <name>

tests/data/test2082

@@ -27,7 +27,7 @@ http
 Pre-request callback for HTTP
 </name>
 <tool>
-libprereq
+lib2082
 </tool>
 
 <command>

tests/data/test2083

@@ -21,7 +21,7 @@ ftp
 Pre-request callback for FTP
 </name>
 <tool>
-libprereq
+lib2082
 </tool>
 
 <command>

tests/data/test2084

@@ -27,7 +27,7 @@ http
 Pre-request callback for HTTP with callback terminating transfer
 </name>
 <tool>
-libprereq
+lib2082
 </tool>
 
 <command>

tests/data/test2085

@@ -35,7 +35,7 @@ http
 Pre-request callback for HTTP with location following
 </name>
 <tool>
-libprereq
+lib2082
 </tool>
 
 <command>

tests/data/test2086

@@ -32,7 +32,7 @@ http-ipv6
 Pre-request callback for HTTP IPv6
 </name>
 <tool>
-libprereq
+lib2082
 </tool>
 
 <command>