Allow aws credential skip validation

[awarecan]

Description:

Add an option to allow credential skip validation, so that access key do not need IAM.GetUser permission

Related issue (if applicable): fixes #22983

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#9196

Example entry for configuration.yaml (if applicable):

aws:
  credentials:
    - name: My AWS Account
      aws_access_key_id: AWS_ID
      aws_secret_access_key: AWS_SECRET
      validate: false

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[github-actions]

Hey there @robbiet480, mind taking a look at this pull request as its been labeled with a integration (aws) you are listed as a codeowner for? Thanks!

[codecov]

Codecov Report

Merging #22991 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev   #22991      +/-   ##
==========================================
+ Coverage   93.95%   93.95%   +<.01%     
==========================================
  Files         448      448              
  Lines       36750    36751       +1     
==========================================
+ Hits        34529    34530       +1     
  Misses       2221     2221

Impacted Files	Coverage Δ
homeassistant/components/aws/const.py	100% <100%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #22991 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev   #22991      +/-   ##
==========================================
+ Coverage   93.95%   93.95%   +<.01%     
==========================================
  Files         448      448              
  Lines       36750    36751       +1     
==========================================
+ Hits        34529    34530       +1     
  Misses       2221     2221

Impacted Files	Coverage Δ
homeassistant/components/aws/const.py	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d078e50...b9219d5. Read the comment docs.