refactor: remove random querystrings from extension build artifacts

[goosewobbler]

Amending the querystrings used in the extension build so that the the build artifacts have consistent hashes. This should enable the extension to be accepted by the Mozilla addons store.

#3351

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[what-the-diff]

PR Summary

• New Feature to Track Version
  New 'currentVersion' property added to give us the ability to keep an eye on and manage application versions.
• Environment Specific Functionality
  The 'hash' property has been updated to vary its value depending on the environment. This will give us more flexibility when operating in different environments.
• Dynamic Script Sourcing in Index
  The source path of the script tag has been updated. With this change, it now uses the 'currentVersion' variable. This allows the right version of the script to be loaded dynamically.