Test LinkedHashMap.removeEldestEntry() implementation that modifies underlying map

The documentation for LinkedHashMap.removeEldestEntry() states:

>  <p>This method typically does not modify the map in any way,
>  instead allowing the map to modify itself as directed by its
>  return value.  It <i>is</i> permitted for this method to modify
>  the map directly, but if it does so, it <i>must</i> return
>  <tt>false</tt> (indicating that the map should not attempt any
>  further modification).  The effects of returning <tt>true</tt>
>  after modifying the map from within this method are unspecified.

This CL adds a test coverage for the case when removeEldestEntry()
modifies underlying map, such as:

 - Removing from map by key
 - Removing from map by both key and value
 - Removing from order-accessed map (rather than insertion-order)
 - Removing from map by other than passed eldest entry

Bug: 71498231
Test: atest core-tests:libcore.java.util.LinkedHashMapTest
Change-Id: I12ff2592b6c640c0d96c1d92d5d93d26b4e7cf21