Add two grpc-web endpoints for node27/28 to ClientConstants.js

[ElijahLynn]

Description:
This PR adds two new grpc-web endpoints to ClientConstants.js. The endpoints have been created in Cloudflare and are pointing to the correct IPs.

Related issue(s):
https://github.com/swirlds/infrastructure/issues/4299

Notes for reviewer:
You can e.g. dig node28.swirldslabs.com +short and see that the entry points to Cloudflare's DNS balancers.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (ff951ea) 76.12% compared to head (e2bda0c) 83.76%.

❗ Current head e2bda0c differs from pull request most recent head 95f313c. Consider uploading reports for the commit 95f313c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2019      +/-   ##
===========================================
+ Coverage    76.12%   83.76%   +7.64%     
===========================================
  Files          304      304              
  Lines        75854    75854              
===========================================
+ Hits         57746    63542    +5796     
+ Misses       18108    12312    -5796     

Files	Coverage Δ
src/constants/ClientConstants.js	0.00% <0.00%> (ø)

... and 107 files with indirect coverage changes

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
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No Coverage information
0.0% Duplication