Support .git in repo cache and improve language

[Alex Ross (alexr00)]

Done while testing #274930

[Copilot]

Pull Request Overview

This PR improves the Git repository caching mechanism by normalizing repository URLs to handle URL variations (with/without .git suffix and trailing slashes), and simplifies user-facing clone messages by removing redundant wording.

• Adds URL normalization to the RepositoryCache class to ensure consistent cache key generation
• Updates all cache operations (set, get, delete) to use normalized URLs
• Simplifies clone completion messages by removing the word "cloned"

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
extensions/git/src/repositoryCache.ts	Adds normalizeRepoUrl method to strip .git suffix and trailing slashes; updates cache operations to normalize URLs before use
extensions/git/src/cloneManager.ts	Simplifies user-facing messages from "cloned repository" to "repository"

Comments suppressed due to low confidence (1)

extensions/git/src/repositoryCache.ts:158

• The load method stores repository URLs without normalization, but cache operations now use normalized URLs. This creates a mismatch: URLs saved before this change (or loaded from persistent storage) won't be found by get/set/delete operations. Apply normalizeRepoUrl to the repo variable at line 156 before storing it in the LRU at line 173.

	private load(): void {
		try {
			const raw = this._globalState.get<[string, [string, RepositoryCacheInfo][]][]>(RepositoryCache.STORAGE_KEY);
			if (!Array.isArray(raw)) {
				return;
			}
			for (const [repo, storedFolders] of raw) {
				if (typeof repo !== 'string' || !Array.isArray(storedFolders)) {
					continue;