Remove HTTP Host step

[dbwiddis]

Description

Removes the HttpHost step, essentially reverting #530. That PR was meant as incremental progress towards a full feature that was later pushed to 2.14. It needs to be revised/changed (such as allowlist validation) so I'd prefer it not be a part of the 2.13 release as it adds no value and would only cause confusion.

The process of reviewing #530 was educational in identifying future requirements for that step.

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

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.62%. Comparing base (4bf6e32) to head (b9f6570).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #562      +/-   ##
============================================
- Coverage     72.91%   72.62%   -0.29%     
+ Complexity      675      665      -10     
============================================
  Files            79       78       -1     
  Lines          3452     3416      -36     
  Branches        273      271       -2     
============================================
- Hits           2517     2481      -36     
  Misses          818      818              
  Partials        117      117              

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-562-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 1ff9649b141e80d3215715bf99cd8cc521c4f226
# Push it to GitHub
git push --set-upstream origin backport/backport-562-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/flow-framework/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-562-to-2.x.