Get rid of unnecessary and failing REST requests when navigating between different browse indexes

[jensvannerum]

References

• Fixes Hitting browse by author from by issue date gets server error #573

Description

• Destroys and reconstructs the browse component when the route changes so that any route change calls ngOnInit in the browse-by component, this way we can be sure that we only care about the first value of the route (necessary for our take(1) in subscription)
  • in the browse-by-page-componentthe type is wrapped in an object so a change from one browse index to another browse index of the same type still causes a lifecycle trigger (since objects are compared by identity).

You could argue that performance wise we don't want to re-build the component every time but any performance gains that this would offer is lost by the multiple useless requests I think

Instructions for Reviewers

• Set this angular branch up against latest main / demo instance
• Open any browse index and switch to other browse indexes while having the 'Network' tab open in developer tools
• Notice no unnecessary requests are being sent and no failing requests are present either (compare to eg current demo.dspace.org)
• Verify browse indexes still work as before including pagination, filtering, ordering thumbnails, etc...

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[alanorth]

Thanks, @jensvannerum. I tested this by navigating to the Browse By Date on sandbox.dspace.org with the network panel open, then switching to Browse by Author.

Before, I see HTTP 500 errors:

After, I see only HTTP 200:

I see some changes to the menu resolver regarding authentication. Was that intentional? Also, I think we should squash these changes to avoid the unnecessary modifications and fixes to packages. Those don't need to live in git forever.

[tdonohue]

@jensvannerum : This PR appears to have failing tests. Could you look into it when you have a chance? Thanks!