GHA-CI: ARM runner for windows, flow optimization and deduplication

[sebres]

• build ARM on windows-11-arm runner: so it'd be testable with a test-suite
• combine linux flows to single config using matrix + code deduplication
• do-release.cmd - rename x32 as x86

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[mcmilk]

This look great. Thanks a lot.

[sebres]

YW.
Theoretically, because everything will be tested now (no cross-compile anymore), following check is not necessary in the test-suite:

7-Zip-zstd/tests/7z.tcl

Lines 30 to 38 in 5ff1307

	# ensure we can test using executable from $Z7_PATH (valid platform, e. g. bypass cross-platform build):
	apply {{} {
	variable Z7_PATH
	if {[catch {exec $Z7_PATH} res opt]} {
	puts "Cannot test using \"$Z7_PATH\" (invalid platform?): $res"
	# 0 - by "invalid argument" (invalid platform), 1 - by other (unexpected) error
	exit [expr {![string match {POSIX EINVAL *} [dict get $opt -errorcode]]}]
	}
	}}

But I tend to retain it for the future and/or for people building it self-hosted in cross-compile way (my humble self;).