[git-loader]: `resolveGlobs` breaks with leading `./` in path

[jeengbe]

Issue workflow progress

Progress of the issue based on the Contributor Workflow

• [ ] 1. The issue provides a reproduction available on Github, Stackblitz or CodeSandbox

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  Please make sure the GraphQL Tools package versions under package.json matches yours.

• [ ] 2. A failing test has been provided
• [ ] 3. A local solution has been provided
• [ ] 4. A pull request is pending review

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Describe the bug

The GitLoader.load() method breaks when a path is provided with a leading ./, which is required when run in a subdirectory, as often is the case with monorepos.

It ends up with errors like:

> graphql-inspector diff "git:develop:./a/b.graphql" ...

error Error: Unable to load file from git: Error: Command failed: git show develop:a/b.graphql
fatal: path 'x/y/a/b.graphql' exists, but not 'a/b.graphql'
hint: Did you mean 'develop:x/y/a/b.graphql' aka 'develop:./a/b.graphql'?

To Reproduce Steps to reproduce the behavior:

n/a

Expected behavior

Git file lookup should work when invoked in a subdirectory.

Environment:

n/a

Additional context

I noticed the issue in the graphql-inspector package and traced it back to here.