Disable http2 for indexServer

[thepetk]

Please specify the area for this PR

/server

What does does this PR do / why we need it:

This PR disables the HTTP2 protocol from the index server, following the instructions from here: https://pkg.go.dev/net/http#hdr-HTTP_2

This task is related to the mitigation of the Rapid Reset CVE. More info can be found in the related issue: devfile/api#1342

Which issue(s) this PR fixes:

Fixes devfile/api#1342

PR acceptance criteria:

• Test Coverage
  • Are your changes sufficiently tested, and are any applicable test cases added or updated to cover your changes?

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (055e74c) 35.93% compared to head (c0fe759) 35.58%.

Files	Patch %	Lines
index/server/pkg/server/index.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
- Coverage   35.93%   35.58%   -0.35%     
==========================================
  Files           7        7              
  Lines        1347     1360      +13     
==========================================
  Hits          484      484              
- Misses        816      829      +13     
  Partials       47       47              

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[thepetk]

As the current issue is related to security, I'd suggest to create a separate issue in order to improve the coverage on index.go (having in mind that the coverage diff is ~0,3%)

[thepetk]

As the current issue is related to security, I'd suggest to create a separate issue in order to improve the coverage on index.go (having in mind that the coverage diff is ~0,3%)

I've created issue devfile/api#1361 in order to keep track of the new test cases implementation

[michael-valdron]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michael-valdron, thepetk

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