[ISSUE #7363] Fix get message from tiered storage return incorrect next begin offset

[lizhimins]

…xt pull offset

Which Issue(s) This PR Fixes

Fixes #7363

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Merging #7365 (6a08f1f) into develop (4a8e0d5) will decrease coverage by 0.14%.
The diff coverage is 71.42%.

@@              Coverage Diff              @@
##             develop    #7365      +/-   ##
=============================================
- Coverage      42.68%   42.54%   -0.14%     
+ Complexity      9482     9443      -39     
=============================================
  Files           1150     1150              
  Lines          82729    82727       -2     
  Branches       10777    10775       -2     
=============================================
- Hits           35311    35195     -116     
- Misses         43012    43125     +113     
- Partials        4406     4407       +1     

Files Changed	Coverage Δ
...pache/rocketmq/tieredstore/TieredMessageStore.java	70.42% <66.66%> (-3.07%)	⬇️
...che/rocketmq/tieredstore/TieredMessageFetcher.java	59.20% <100.00%> (ø)

... and 45 files with indirect coverage changes

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[lollipopjin]

LGTM