fix: hash on untracked folders

[jLopezbarb]

Proposed changes

Fixes DEV-231

• Use git ls-files--others --exclude-standard in order to get the files that are untracked.
• Previous method was getting the folders and we were not iterating through them making it impossible to track if there was a file in a untracked folder

How to validate

1. create a new dir mkdir new-dir && cd new-dir
2. Create the following okteto.yml:

build:
  test-service:
    context: test

3. commit the file: git init && git add . && git commit -m "initial commit"
4. create the context folder mkdir test
5. Create the following Dockerfile inside:

FROM alpine

6. Create other files on the root of the project and check that it's not building
7. Create other files on the test folder and check that we are always returning the same order (I tested with 20 files and check that is only building the first time)

CLI Quality Reminders 🔧

For both authors and reviewers:

• Scrutinize for potential regressions
• Ensure key automated tests are in place
• Build the CLI and test using the validation steps
• Assess Developer Experience impact (log messages, performances, etc)
• If too broad, consider breaking into smaller PRs
• Adhere to our code style and code review guidelines

[codecov]

Codecov Report

Attention: Patch coverage is 48.83721% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 45.65%. Comparing base (cce75fc) to head (28f2f9f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4263      +/-   ##
==========================================
- Coverage   45.65%   45.65%   -0.01%     
==========================================
  Files         306      306              
  Lines       27676    27710      +34     
==========================================
+ Hits        12635    12650      +15     
- Misses      13963    13979      +16     
- Partials     1078     1081       +3