mask .envvars + only mask vars longer than 5 chars

[andreafalzetti]

Proposed changes

Fixes: DEV-290

1. mask vars coming from the .env file
2. mask vars only if they are longer than 5 chars

How to validate

1. Using https://github.com/okteto/go-getting-started
2. Create a .env with vars of different lengths
3. Modify the deploy commands to print those vars, of print the whole env
4. Using 2.26.0 validate that the vars coming from the .env are not masked
5. Then build this branch and run okteto deploy and okteto destroy and check the logs, make sure the logic is implemented as described

Note: multi-line vars are currently not masked

[codecov]

Codecov Report

Merging #4245 (152678a) into master (390ef76) will decrease coverage by 0.03%.
The diff coverage is 33.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4245      +/-   ##
==========================================
- Coverage   45.60%   45.58%   -0.03%     
==========================================
  Files         305      305              
  Lines       27600    27602       +2     
==========================================
- Hits        12588    12583       -5     
- Misses      13939    13944       +5     
- Partials     1073     1075       +2