Data is not consistency when conver tiflash mode to normal

[lilinghai]

Bug Report

convert tiflash mode from fast to normal and check consistency using diff tikv with tiflash, the result is :
result inconsistent tso 435126922503258118, tikv: [2100000], tiflash [4016148]

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6.2

[JaySon-Huang]

The root cause is that TiFlash can not fetch the table info after a table has been dropped

similar to
#1664, #3777

The logs info will be updated later

[JaySon-Huang]

close as we only support fast scan variable instead of table mode since 6.3

ref #5589