Fix profile validation

[rusowyler]

Description of changes:

• Correct the validation for the profile

  You can use letters, numbers, hyphens ( - ), and underscores ( _ ), but no spaces.

• Added additional profile name validation alternatives to the tests

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[calvin-c-stellantis]

Has this PR been merged? If not could you please merge?

Thanks a lot.

[iwamot]

I too wasted some time due to underscores not being allowed.

It seems to me that this PR should be merged immediately to avoid user confusion.

By the way, aws-sdk-java-v2 defines the following:

private static final Pattern VALID_IDENTIFIER = Pattern.compile("^[A-Za-z0-9_\\-/.%@:\\+]*$");

[ankon]

Our profile names contain :, and the documentation doesn't anywhere say that that would be invalid: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html#cli-configure-files-using-profiles

It seems that this actually got merged (specifically in #246 / 305bc82), so: @CihanBosnali could you please double check the discussion here?