db: Added the missing primary key constraint drops for manifestpullstatistics and tagpullstatistics table (PROJQUAY-8414)

[deshpandevlab]

These tables were introduced in migration 7078c84d14e8_add_pull_statistics_tables.py and are used to track: tagpullstatistics: Pull statistics per repository tag manifestpullstatistics: Pull statistics per manifest digest

The tables support a pull statistics feature that tracks how often different tags and manifests are pulled from repositories.

This change fixes the failing cypress tests for the database updates

Testing

npm run quay:dump

> [email protected] quay:dump
> ${CLIENT:=docker} exec quay-db pg_dump -U quay -d quay --clean --if-exists > ./cypress/test/quay-db-data.txt && ${CLIENT:=docker} cp quay-quay:/datastorage/registry/. ./cypress/test/quay-storage-data

Successfully copied 73.2kB to /Users/shudeshp/Desktop/workspace/quay/web/cypress/test/quay-storage-data

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 70.56%. Comparing base (dff9fa8) to head (456b56f). :warning: Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4332      +/-   ##
==========================================
- Coverage   70.56%   70.56%   -0.01%     
==========================================
  Files         447      447              
  Lines       42881    42881              
  Branches     4902     4902              
==========================================
- Hits        30260    30259       -1     
  Misses      10907    10907              
- Partials     1714     1715       +1     

Flag	Coverage Δ
unit	70.56% <ø> (-0.01%)	:arrow_down:

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