Add filters to the URL parameters of the get data page so it is linkable

[NoopDog]

So from

/explore/getdata

to

/explore/getdatafilter=%5B%7B%22facetName%22%3A%22projectId%22%2C%22terms%22%3A%5B%22005d611a-14d5-4fbf-846e-571a1f874f70%22%5D%7D%5D

[MillenniumFalconMechanic]

App Load

ProjectsCanActivateGuard

• Rename to indicate applicable to any route (eg FilterCanActivateGuard)
• Generalize URLTree returned so it can handle any route (and not just projects)
• Implement both canActivate and canActivateChild interfaces
• Update canActivate and canActivateChild specs on routes
• Update specs
• See CatalogCanActivateGuard for examples
• See Add DCP1 catalog parameter to all incoming URLs if no catalog is specified #1438

Internal Navigation

[routerLink] and router.navigate

• Add queryParamHandling: merge for template and explicit calls to navigate
• See Preserve catalog query parameter on internal links #1439

Internal State Changes

• TODO