[fix](image) fix bug that latestValidatedImageSeq may not be the second largest image id (#11201)

* [fix](image) fix bug that latestValidatedImageSeq may not be the second largest image id

When traversing the image files in the meta directory,
it cannot be guaranteed to be traversed in the order of imageid size

For example, if it traverses the image file with orders like: 3,5,4,1,
then latestImageSeq is 5, but latestValidatedImageSeq is 3, which is wrong.

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,16 +4,36 @@ Issue Number: close #xxx
 
 ## Problem Summary:
 
-Describe the overview of changes.
-
 ## Checklist(Required)
 
-1. Does it affect the original behavior: (Yes/No/I Don't know)
-2. Has unit tests been added: (Yes/No/No Need)
-3. Has document been added or modified: (Yes/No/No Need)
-4. Does it need to update dependencies: (Yes/No)
-5. Are there any changes that cannot be rolled back: (Yes/No)
+1. Type of your changes:
+    - [ ] Improvement
+    - [ ] Fix
+    - [ ] Feature-WIP
+    - [ ] Feature
+    - [ ] Doc
+    - [ ] Refator
+    - [ ] Others: 
+2. Does it affect the original behavior: 
+    - [ ] Yes
+    - [ ] No
+    - [ ] I don't know
+3. Has unit tests been added:
+    - [ ] Yes
+    - [ ] No
+    - [ ] No Need
+4. Has document been added or modified:
+    - [ ] Yes
+    - [ ] No
+    - [ ] No Need
+5. Does it need to update dependencies:
+    - [ ] Yes
+    - [ ] No
+6. Are there any changes that cannot be rolled back:
+    - [ ] Yes
+    - [ ] No
 
 ## Further comments
 
 If this is a relatively large or complex change, kick off the discussion at [dev@doris.apache.org](mailto:dev@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc...
+