[0.14.0] Retrieve default branch from github API.

[hhellyer]

What type of PR is this ?

• [X] Bug fix
• [ ] Enhancement

What does this PR do ?

Removes the assumption that a repositories default branch is master and replaces it with a query via the github API to find the default branch name. See: https://developer.github.com/v3/repos/#get-a-repository (We use the github API written in Go to access this.)

I've tested this by running: cwctl --insecure project create --conid KB9FJ0QO --p ~/work/codewind/codewind-workspace/odo-java --url https://codeload.github.com/spring-projects/spring-petclinic and it is now possible to create a Codewind project from that github repository.

Which issue(s) does this PR fix ?

This resolves being unable to create a project from the ODO Java template. This was caused by the project renaming it's default branch from master to main.

Link to the Codewind repository issue(s) this PR fixes or references:

https://github.com/eclipse/codewind/issues/3197

Does this PR require a documentation change ?

Any special notes for your reviewer ?

This is a port of the same changes merged into master under https://github.com/eclipse/codewind-installer/pull/504

[codecov[bot]]

Codecov Report

Merging #507 into 0.14.0 will increase coverage by 0.04%. The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           0.14.0     #507      +/-   ##
==========================================
+ Coverage   19.35%   19.39%   +0.04%     
==========================================
  Files          81       81              
  Lines        7031     7042      +11     
==========================================
+ Hits         1361     1366       +5     
- Misses       5499     5503       +4     
- Partials      171      173       +2     

Impacted Files	Coverage Δ
pkg/utils/download.go	52.11% <50.00%> (-0.56%)	:arrow_down:
pkg/project/create.go	50.48% <100.00%> (ø)

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