docs: create v2 upgrading guide skeleton #76666

Job	Run time
test-clientv2	28s
test-integration	31s
test-sim-nondeterminism	34s
split-test-files	21s
test-collections	27s
test-collections-protocodec	28s
test-confix	26s
test-core	27s
test-coretesting	24s
test-cosmovisor	26s
test-depinject	34s
test-errors	27s
test-math	43s
test-indexer-postgres	26s
test-orm	22s
test-schema	29s
test-schema-testing	30s
test-simapp-v2	22s
test-hubl	22s
test-log	28s
test-store	39s
test-store-v2	45s
test-x-accounts	23s
test-x-accounts-lockup	23s
test-x-accounts-base	21s
test-x-accounts-multisig	19s
test-x-circuit	23s
test-x-distribution	28s
test-x-evidence	25s
test-x-feegrant	25s
test-x-group	25s
test-x-nft	24s
test-x-params	22s
test-x-protocolpool	22s
test-x-tx	26s
test-x-upgrade	22s
test-x-authz	32s
test-x-bank	26s
test-x-consensus	27s
test-x-epochs	21s
test-x-gov	25s
test-x-mint	23s
test-x-slashing	23s
test-x-staking	25s
test-tools-benchmark	33s
tests (00)	36s
tests (01)	28s
tests (02)	27s
tests (03)	39s
repo-analysis	22s
	22m 34s

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