fix(@angular/build): keep background referenced HMR update chunks #29508
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When HMR is enabled and a component update is sent to the development server, the following background incremental update will no longer remove the previous JavaScript chunk files for lazy routes. This allows the active and running application code within the browser to still access the lazy chunks referenced in the code. This is important for cases such as when a component in a lazy route (that has not yet been accessed) is modified. In this case, the component update is still processed if/when the lazy route is eventually accessed via the module-time evaluation of the component update code.
Closes #29507