chore: parameterise app name used in auth

[kathaypacific]

Description

This PR updates the network config file to use the APP_REGISTRY_NAME env variable for the auth headers in networkConfig.ts, to reduce the number of places we need to update the app name.

Test plan

n/a

Related issues

n/a

Backwards compatibility

Y

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.73%. Comparing base (f35b078) to head (d55414c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6078      +/-   ##
==========================================
- Coverage   88.73%   88.73%   -0.01%     
==========================================
  Files         727      727              
  Lines       30772    30772              
  Branches     5614     5306     -308     
==========================================
- Hits        27307    27306       -1     
- Misses       3267     3423     +156     
+ Partials      198       43     -155     

Files with missing lines	Coverage Δ
src/config.ts	96.36% <100.00%> (+0.03%)	⬆️
src/web3/networkConfig.ts	100.00% <100.00%> (ø)

... and 67 files with indirect coverage changes

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[jeanregisser]

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