GoEx Gitignore User Credentials (#344)

Make sure that user creds aren't version tracked. Ex:
`credentials/slack` needs to be ignored as well

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Co-authored-by: Noppapon (Neun) Chalermchockcharoenkit <[email protected]>

Author: royh02

.gitignore

@@ -14,6 +14,8 @@ dist
 ./berkeley-function-call-leaderboard/eval_checker/tree-sitter-java
 ./berkeley-function-call-leaderboard/eval_checker/tree-sitter-javascript
 goex/exec_engine/checkpoints/
-goex/exec_engine/credentials/secret_store.json
+goex/exec_engine/credentials/*
+!goex/exec_engine/credentials/credentials_utils.py
+!goex/exec_engine/credentials/supported.txt
 goex/docker/*/requirements.txt
 goex/docker/misc/images.json