chore: improve error message when the client cannot find org by name

[bednar]

Closes #403

Proposed Changes

Add better error message when the used token doesn't have permission to read organizations.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #408 (39101ea) into master (64a401e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   93.24%   93.25%   +0.01%     
==========================================
  Files          28       28              
  Lines        2501     2506       +5     
==========================================
+ Hits         2332     2337       +5     
  Misses        169      169              

Impacted Files	Coverage Δ
influxdb_client/client/exceptions.py	100.00% <100.00%> (ø)
influxdb_client/client/util/helpers.py	100.00% <100.00%> (ø)

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