Remove NUMBER_OF_COLUMNS and MAX_CELLS_IN_EXTENDED_MATRIX configuration. (#16073)

**What type of PR is this?**
Other

**What does this PR do? Why is it needed?**
This pull request removes `NUMBER_OF_COLUMNS` and
`MAX_CELLS_IN_EXTENDED_MATRIX` configuration.

**Other notes for review**
Please read commit by commit, with commit messages.

**Acknowledgements**
- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description to this PR with sufficient context for
reviewers to understand this PR.

specrefs/presets.yml

@@ -557,8 +557,8 @@
 
 - name: NUMBER_OF_COLUMNS
   sources:
-    - file: config/params/config.go
-      search: NumberOfColumns\s+uint64
+    - file: config/fieldparams/mainnet.go
+      search: NumberOfColumns\s*=
       regex: true
   spec: |
     <spec preset_var="NUMBER_OF_COLUMNS" fork="fulu" hash="f6441e62">