feat: replace issue templates with forms

[displague]

Implements https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-forms

Heavily copied from from Linode and AWS provider issue forms:

• https://github.com/linode/terraform-provider-linode/tree/dev/.github/ISSUE_TEMPLATE
  https://github.com/linode/terraform-provider-linode/issues/new/choose
• https://github.com/hashicorp/terraform-provider-aws/tree/main/.github/ISSUE_TEMPLATE
  https://github.com/hashicorp/terraform-provider-aws/issues/new/choose

[displague]

There may be other variables to consider here for debugging.

We could also caution against submitting client_id, client_secret, auth_token, authorization headers, and x-auth-token headers

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (872618d) 59.56% compared to head (2f9fa6a) 60.40%.
Report is 19 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
+ Coverage   59.56%   60.40%   +0.83%     
==========================================
  Files          98       99       +1     
  Lines       19754    19889     +135     
==========================================
+ Hits        11767    12013     +246     
+ Misses       7684     7574     -110     
+ Partials      303      302       -1     

Files	Coverage Δ
equinix/data_source_metal_port.go	100.00% <100.00%> (ø)
equinix/data_source_metal_spot_market_request.go	86.86% <100.00%> (+3.03%)	⬆️
equinix/helpers_device.go	84.91% <100.00%> (+7.34%)	⬆️
equinix/provider.go	82.14% <100.00%> (+0.05%)	⬆️
equinix/resource_metal_port.go	89.84% <100.00%> (+1.64%)	⬆️
equinix/resource_metal_spot_market_request.go	65.80% <100.00%> (+8.12%)	⬆️
equinix/resource_metal_vrf.go	86.40% <100.00%> (-0.53%)	⬇️
equinix/data_source_metal_device_bgp_neighbors.go	97.65% <94.11%> (+26.56%)	⬆️
equinix/data_source_metal_vrf.go	89.58% <33.33%> (ø)
equinix/port_helpers.go	77.33% <81.81%> (+4.64%)	⬆️
... and 1 more

... and 4 files with indirect coverage changes

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[displague]

Updates to the ISSUE_TEMPLATE directory shouldn't trigger E2E tests ✍️