chore: release: Update release_issue_template

[rjan90]

Updates the release_issue_template with some improvements:

• Changed some wrong links (links pointed to version.go in IPFS-repo)
• Removed Create a discussion for this release
• Removed "Prep the changelog using scripts/mkreleaselog, and add it to CHANGELOG.md" since this already has been captured in the first pre-release/release-candiadte step. Left that you should make sure that the CHANGELOG is up to date.
• Changed the Cut the release-link to be prerelease=false in the Stable Release step.

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green