docs(release): v1.34.0 and v1.34.1 release template improvements

[BigLep]

Summary

• Remove "major" release level option from release CLI since we don't have special logic for major releases and have never done a major version release
• Add "(nv$networkVersion)" suffix to GitHub issue titles when a network upgrade version is specified
• Minor whitespace cleanup to release template

This PR will be used to collect incremental improvements during the v1.34.0 release process as recommended in the release template.

Changes that need to be made

• When dealing with the node and miner release, we don't list commands about cherrypicking commits across to the miner branch.
• Document more of the changelog prep commands like build: release Lotus Node and Miner v1.34.0-rc1 #13314 (comment)
• Document when the draft RC release gets triggered
• Document about copy/pasting changelog back into the release itself
• Manual release GitHub workflow should default to ["node", "miner"] so more obvious what to put in there
• It would generally be great to see our CI be able to run faster
• Why did releases get assigned to galargh in https://filecoinproject.slack.com/archives/C027TQMUVJN/p1757019721331769 ?
• Document about how to handle changelog entries for new RCs
• Final release should make sure using final releases of go-state-types, filecoin-ffi and that actors CIDs don't change.
• Is there any guide about the kind of content to have for things like the migration section of the changelog?
• We should update the template so that it's clear that the "before RC1" tasks need to be done even if not doing an RC
• For network upgrades, also need to update the network name like fix: update nv27 naming #13318

Changes Made

1. Release Script (cmd/release/main.go):

   • Removed "major" from allowed release levels (now only "minor" and "patch")
   • Updated validation logic to exclude "major" releases
   • Added network version suffix to GitHub issue titles when network upgrade is specified

2. Release Template (documentation/misc/RELEASE_ISSUE_TEMPLATE.md):

   • Added trailing newline for consistency

🤖 Generated with Claude Code

[rjan90]

Ah, I thought this PR was only for the release scripts improvements. But this might also encompass more findings when developing the v1.34.0 release. I will therefore dismiss my review until it goes out of draft

Waiting till it is going out of draft