fix: respect .gitignore negation patterns when copying project files

[PHILLIPS71]

Why

.gitignore negation patterns (e.g. .eas/* + !.eas/build/) were not being respected when copying project files. Once a file or directory was marked as ignored, there was no way for a negation rule in the same .gitignore to un-ignore it. This also affected .gitignore files inside dot-directories (e.g. .eas/.gitignore), which were never discovered at all.

How

1. Negation support - switched ignores() from an early-return loop to accumulating state. It now uses ignore.test() instead of ignore.ignores() to get both ignored and unignored signals, so a negation rule in the same .gitignore instance can override an earlier positive rule.

2. Dot-directory discovery - added dot: true to the fast-glob call that finds .gitignore files, so files like .eas/.gitignore are picked up.

3. Directory negation patterns - node:fs omits trailing slashes from directory paths, so patterns like !build/ never matched. The filter now calls lstatSync to detect directories and appends a trailing slash before passing the path to ignores(), which correctly distinguishes !build/ (directory) from a file named build.

Test Plan

Automated tests added in packages/eas-cli/src/vcs/__tests__/local-test.ts covering:

• negation patterns un-ignoring a directory and its contents in the same .gitignore
• the no-negation baseline still ignoring correctly
• !build/ not incorrectly un-ignoring a file named build
• .gitignore files inside dot-directories being picked up

To verify manually, add .eas/* and !.eas/build/ to your project's .gitignore and run a build. The .eas/build/ directory should be included in the uploaded archive.

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