refactor: Remove bluebird from lib/utils

[juanjoDiaz]

Addresses: #7171

I have few more areas asyncified in stashes in my local so I can keep submiting some of these.

[codecov]

Codecov Report

Merging #8972 (b49b2d0) into master (36c78c7) will increase coverage by 0.02%.
The diff coverage is 95.90%.

@@            Coverage Diff             @@
##           master    #8972      +/-   ##
==========================================
+ Coverage   87.69%   87.72%   +0.02%     
==========================================
  Files         268      268              
  Lines       10050    10033      -17     
==========================================
- Hits         8813     8801      -12     
+ Misses       1237     1232       -5     

Impacted Files	Coverage Δ
lib/utils/open.js	12.50% <66.66%> (-1.09%)	⬇️
lib/utils/createFromTemplate.js	95.00% <91.66%> (+11.66%)	⬆️
lib/utils/yamlAstParser.js	98.18% <96.42%> (+0.86%)	⬆️
lib/utils/downloadTemplateFromRepo.js	96.55% <98.00%> (-0.09%)	⬇️
lib/utils/fs/createZipFile.js	100.00% <100.00%> (ø)

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[pgrzesik]

Thank you @juanjoDiaz 🙇 All the proposed changes look good 👍 It was planned to first address marking functions as async/await before moving to further refactor, but I think in this case it's okay and there's no need to block this PR. 👍