Fix/maintenance window task regex

[GlennChia]

Issue #, if available:

Description of changes:

• Fix Regex Patterns for MaxConcurrency and MaxErrors to correctly reflect what is allowed on the console.
• MaxConcurrency
  1. Allows a Percentage from 1 to 100%
  2. Minimum Value: 1
  3. Maximum Value: 7
• MaxErrors
  1. Allows a Percentage from 0 to 100%
  2. Minimum Value: 0
  3. Maximum Value: 7

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