Better export.ps1 (IDFGH-14425)

[SaintFTS]

Now, if you want to add this ps1 file to the $PATH without adding other scripts, like install.ps1, you can now just drag it in some empty directory and add it to the $PATH. Just define $IDF_PATH. Suggestion to define $IDF_PATH was already in the script, but It didn't work because $IDF_PATH was just set to the root of the script ("$PSScriptRoot"). I also added more "clean" exit out of a script - it won't just scrap $IDF_PATH enviroment variable if it didn't find python scripts.

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[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "Better export.ps1": body's lines must not be longer than 100 characters summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	The source branch "SaintFTS-esp-idf-export-fix" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.

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