Add the rbu_exclusive_checkpoint query parameter to RBU.

FossilOrigin-Name: c2d33ea9d81975b27fe157d698033e7c01569cc0aa6178b7f0c43afbfba4a9e2

diff --cc manifest
index e549136985d1fa233b6d2991b0da9eeb95b1a196,e0d33fccd7e8cdd148157b70a4e9a5d6e0e5c309..8378de68106269aca05ac913c87293be066524a2
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Update\san\sassert()\sstatement\sto\sconform\sto\sthe\schanges\sof\sthe\sprevious\scheck-in.
- D 2021-11-05T19:52:27.167
 -C New\stest\scases\sfor\srbu_exclusive_checkpoint\squery\sparameter.
 -D 2021-11-05T22:23:17.942
++C Add\sthe\srbu_exclusive_checkpoint\squery\sparameter\sto\sRBU.
++D 2021-11-05T22:35:09.805
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1930,7 -1931,7 +1931,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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diff --cc manifest.uuid
index b70e831af339ea33213d25ef3739fcc32debb42d,010e103d4e18314a3ac6d7323f79bf7ef5a91d0f..33a18fd34909d7d57266655a7b718a2541787321
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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++c2d33ea9d81975b27fe157d698033e7c01569cc0aa6178b7f0c43afbfba4a9e2