Draft: Use object.freeze on diff lines to save memory
What does this MR do?
To help improve the memory in the diffs app we are now freezing some diff line with Object.freeze. Doing this signals to Vue that this data won't be changing so Vue won't add any getters/setters/watchers to this data.
To achieve this I have created a new property called constants that will hold this frozen data, hopefully this will ease any mis-understanding why certain properties don't trigger re-renders.
Improvement wise - I have been seeing a small improvement, 3% reduction in memory, locally on a relatively small merge request.
Closes #333887 (closed)
Screenshots (strongly suggested)
Does this MR meet the acceptance criteria?
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