functions: apply .funcignore rules in Fingerprint()

[Vi-shub]

Context

Fingerprint documents that future behavior should respect .funcignore, but the implementation only skips .func and .git directories.

Code

pkg/functions/client.go -> Fingerprint walk skips RunDataDir and .git only; comment says “Future updates will include … .funcignore”.

Goal

• Parse .funcignore (same semantics as reasonable for this project).
• Skip ignored paths when hashing so fingerprints match intended source sets.

Acceptance criteria

• Unit tests with a small tree + .funcignore proving ignored files do not affect the hash.

While diving in codebase more I found this :)

[gauron99]

Yes this is a known issue, thanks for reporting :)