[enhance]: need to check rollup Interval when memory database refreshing

[stone1100]

What problem does this PR solve?

Issue Number: #945

Problem Summary:
if rollup interval < memory database TTL, using rollup interval to check if need to flush

Check List

Tests

• Unit test
• Integration test
• No code

[codecov]

Codecov Report

Merging #947 (fee4f40) into main (0f5d845) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head fee4f40 differs from pull request most recent head 0af4904. Consider uploading reports for the commit 0af4904 to get more accurate results

@@           Coverage Diff           @@
##             main     #947   +/-   ##
=======================================
  Coverage   96.30%   96.30%           
=======================================
  Files         416      416           
  Lines       25348    25353    +5     
=======================================
+ Hits        24412    24417    +5     
  Misses        665      665           
  Partials      271      271           

Impacted Files	Coverage Δ
tsdb/data_family.go	100.00% <100.00%> (ø)

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