tools.vpm: improve handling of urls that end with .git (#19758)

cmd/tools/vpm/install.v

@@ -43,7 +43,7 @@ fn vpm_install(requested_modules []string, opts []string) {
 					eprintln('Errors while parsing module url "${raw_url}" : ${err}')
 					continue
 				}
-				mod_name := url.path.all_after_last('/')
+				mod_name := url.path.all_after_last('/').replace('.git', '')
 				if mod_name in installed_modules {
 					already_installed << mod_name
 					i_deleted << i
@@ -150,7 +150,7 @@ fn vpm_install_from_vcs(modules []string, vcs &VCS) {
 		}
 		// Module identifier based on URL.
 		// E.g.: `https://github.com/owner/awesome-v-project` -> `owner/awesome_v_project`
-		mut ident := url.path#[1..].replace('-', '_')
+		mut ident := url.path#[1..].replace('-', '_').replace('.git', '')
 		owner, repo_name := ident.split_once('/') or {
 			errors++
 			eprintln('Errors while retrieving module name for: "${url}"')

cmd/tools/vpm/install_test.v

@@ -63,6 +63,9 @@ fn test_install_already_existent() {
 	}
 	assert mod.name == 'markdown'
 	assert mod.dependencies == []string{}
+	// The same module but with the `.git` extension added.
+	os.execute_or_exit('${v} install https://github.com/vlang/markdown.git')
+	assert res.output.contains('already exists')
 }
 
 fn test_install_once() {