Support file-scoped namespaces in SA1649 and SA1402

[sharwell]

Fixes #3435

[codecov]

Codecov Report

Merging #3436 (6464966) into master (88d9d3f) will increase coverage by 3.27%.
The diff coverage is 100.00%.

❗ Current head 6464966 differs from pull request most recent head e1f52bf. Consider uploading reports for the commit e1f52bf to get more accurate results

@@            Coverage Diff             @@
##           master    #3436      +/-   ##
==========================================
+ Coverage   89.86%   93.13%   +3.27%     
==========================================
  Files        1045     1047       +2     
  Lines      108919   112349    +3430     
  Branches     3976     3976              
==========================================
+ Hits        97876   104633    +6757     
+ Misses       9971     6649    -3322     
+ Partials     1072     1067       -5