Skip duplciates check for large table

What does this MR do and why?

Skip duplciates check for large table

Skips duplicate check for the index corruption, if the table size is large than configured max table size

References

• Related to Collation Checker should spot run duplicates ch... (#558274 - closed)

Screenshots or screen recordings

How to set up and validate locally

1. Checkout the branch

2. Apply the patch

   git apply <<'EOF'
   diff --git a/lib/gitlab/database/collation_checker.rb b/lib/gitlab/database/collation_checker.rb
   index cc943cbb3ac6..2dcd05bb5098 100644
   --- a/lib/gitlab/database/collation_checker.rb
   +++ b/lib/gitlab/database/collation_checker.rb
   @@ -6,7 +6,7 @@ class CollationChecker
          include Gitlab::Database::Migrations::TimeoutHelpers
    
          # Maximum table size in bytes for running duplicate checks
   -      MAX_TABLE_SIZE_FOR_DUPLICATE_CHECK = 1.gigabyte
   +      MAX_TABLE_SIZE_FOR_DUPLICATE_CHECK = 0.gigabyte
    
          COLLATION_VERSION_MISMATCH_QUERY = <<~SQL
              SELECT
   EOF

3. Visit the admin page: http://gdk.test:3000/admin/database_diagnostics

MR acceptance checklist

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