Add --try-no-prompt flag

[xenia-lang]

--try-no-prompt uses credentials from non-interactive sources, if possilbe.Otherwise it prompts the user to enter these credentials.

This optimizes the workflow by eliminating the need to press enter when valid credentials are present, while allowing to have them added to the keyring without the need to rerun the command (as would be necessary with --no-prompt). --no-prompt is still available for non-interactive usecases (see discussion in #101). This also creates an obvious place in the interface to add the functionality discussed in #101.

Naming of the new flag is open for discussion. Its placement (loginFlags vs commonFlags) is as well.

Unfortunately, I do not have an overview over all the use cases for saml2aws. If these changes hinder any use case, guidance is much appreciated. Same goes for general use of the Go language.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 28.13%. Comparing base (99d6fe4) to head (0625a7b).
Report is 155 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/saml2aws/commands/login.go	0.00%	3 Missing ⚠️
cmd/saml2aws/main.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1428       +/-   ##
===========================================
- Coverage   42.19%   28.13%   -14.06%     
===========================================
  Files          54       70       +16     
  Lines        6456    12543     +6087     
===========================================
+ Hits         2724     3529      +805     
- Misses       3283     8538     +5255     
- Partials      449      476       +27     

Flag	Coverage Δ
unittests	28.13% <0.00%> (-14.06%)	⬇️

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[tinaboyce]

@xenia-lang Massive thanks for working on this. I have tested locally and can confirm it is working as expected, and I'm looking forward to using this.

[xenia-lang]

Very happy to get this merged. Since I am also really looking forward to it, I'd like to ask: When is the next release planned?

To be clear, I'm not trying to be pushy. I'd just like to get an idea of how long we need to wait before we can use this.