Fixes and new tests logic to ensure that the btree overflow page cache is

only used when it is consistent.  This resolves the malfunction observed
in [forum:/forumpost/284955a3cd454a15|forum post 284955a3cd454a15].

FossilOrigin-Name: 5dede50d9e7b6942df9f7b00fbfeaa2103c36c5da01d63d88136fb0ef4b7d26d

diff --cc manifest
index eab5ebd169b679be270f819462e223fe0ea40bc3,17af6203032ee285efe222945ea3b19326d913ec..ceff35c009c9cd7bbb30c901e0eac9b3722374da
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\shandling\sof\sthe\sSQLITE_OMIT_WAL\scheck\sin\sone\splace.\sResolves\s[forum:87cc13302de160eb|forum\spost\s87cc13302de160eb].
- D 2024-04-11T19:08:12.217
 -C Add\sassert()\sstatements\sto\shelp\sverify\sthe\soverflow\spage\scache.
 -D 2024-04-12T13:05:36.039
++C Fixes\sand\snew\stests\slogic\sto\sensure\sthat\sthe\sbtree\soverflow\spage\scache\sis\nonly\sused\swhen\sit\sis\sconsistent.\s\sThis\sresolves\sthe\smalfunction\sobserved\nin\s[forum:/forumpost/284955a3cd454a15|forum\spost\s284955a3cd454a15].
++D 2024-04-12T15:02:16.718
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2184,8 -2184,8 +2184,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 6d2c7ac4ecfc1ec408cb1820985a70650d7cc5613b4b8fd1829f68ea48fce6a3
- R 0071938b1b4e5105037f1334ca733633
- U stephan
- Z d6eaf14882bbc596d43b8bd29ecbee42
 -P 4efecd6167de71500c90b63155eba1b8567c90e9d1e282fbea54130f9ee21813
++P 5dae6e6df4921f42e45c6c8de40853ab63f53a4bd1d9088a8cdac957ce62f196 0ebc65481f4a3e7974558adea51c620a025bc0e76c0a139e549b56c5abe0cabb
+ R 733b2640d8dc44517728193a890baeff
++T +closed 0ebc65481f4a3e7974558adea51c620a025bc0e76c0a139e549b56c5abe0cabb
+ U drh
 -Z 6194d89088ab528754e159fb92573073
++Z 49129cd4194bac4dbb6265651119b7c1
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 4d8c2440eca92a348c203aaf6d7bbd420410626b,621be8e4f98221e12f1d6a182ef651ef306a35a3..8b1f8f1238f6c8e569b77bbbfcb21364a4f02133
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 5dae6e6df4921f42e45c6c8de40853ab63f53a4bd1d9088a8cdac957ce62f196
 -0ebc65481f4a3e7974558adea51c620a025bc0e76c0a139e549b56c5abe0cabb
++5dede50d9e7b6942df9f7b00fbfeaa2103c36c5da01d63d88136fb0ef4b7d26d