Fix gf command to handle parent directory references

[ekinakkaya]

What this PR does / why we need it
This PR fixes the gf command, ensuring it properly resolves parent directory (../) references. Previously, gf failed to navigate to files outside the current directory.

Which issue(s) this PR fixes
Fixes #9439

Special notes for your reviewer

• I could not add test cases since the build-test command does not work for me. Here is the output of build-test. Maybe it is an issue that occurs on my machine:

PS C:\Users\ekin_\projeler\Vim> npm run build-test

> vim@1.29.0 build-test
> gulp prepare-test

[15:15:01] Using gulpfile ~\projeler\Vim\gulpfile.js
[15:15:01] Starting 'prepare-test'...
[15:15:01] Starting 'tsc'...
[15:15:01] Starting 'copyPackageJson'...
C:/Users/ekin_/projeler/Vim/node_modules/@types/glob/index.d.ts(29,42): error TS2694: Namespace '"C:/Users/ekin_/projeler/Vim/node_modules/minimatch/dist/commonjs/index"' has no exported member 'IOptions'.
C:/Users/ekin_/projeler/Vim/node_modules/@types/glob/index.d.ts(75,30): error TS2724: '"C:/Users/ekin_/projeler/Vim/node_modules/minimatch/dist/commonjs/index"' has no exported member named 'IMinimatch'. Did you mean 'Minimatch'?
TypeScript: 2 semantic errors
TypeScript: emit failed
[15:15:10] The following tasks did not complete: prepare-test, tsc, copyPackageJson
Did you forget to signal async completion?

[J-Fields]

Thanks!