fix: override http datasource logical IDs

[cjihrig]

Description of changes

This commit overrides the logical IDs of http datasources
created by the gql v2 transformer to prevent issues when
migrating from v1. It also renames the @http stack to be
consistent with v1.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[lazpavel]

LGTM

[codecov-commenter]

Codecov Report

Merging #8714 (a161af4) into master (f798bbf) will decrease coverage by 0.00%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master    #8714      +/-   ##
==========================================
- Coverage   56.92%   56.91%   -0.01%     
==========================================
  Files         756      756              
  Lines       42231    42233       +2     
  Branches     8651     8651              
==========================================
  Hits        24038    24038              
- Misses      17372    17374       +2     
  Partials      821      821              

Impacted Files	Coverage Δ
...ify-graphql-transformer-core/src/transform-host.ts	24.79% <0.00%> (-0.42%)	⬇️
...l-http-transformer/src/graphql-http-transformer.ts	98.34% <100.00%> (ø)

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