*: convert remaining sequence diagrams from PNG to Mermaid (#21649)#21658
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This is an automated cherry-pick of #21649
What is changed, added or deleted? (Required)
The remaining images which are obviously sequence diagrams are converted to mermaid. Totally 8 images are found from 4 pages.
br/br-log-architecture.md("BR log backup process design" & "Point-in-time recovery process design")br/br-snapshot-architecture.md("snapshot backup process design" & "snapshot restore process design")dm/feature-shard-merge-pessimistic.md("shard-ddl-flow")pessimistic-transaction.md("TiDB pessimistic transaction commit process" & "Pessimistic transactions in TiDB" & "Pipelined pessimistic lock")Which TiDB version(s) do your changes apply to? (Required)
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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.
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