ci: Add release flag for nightly build tag

[gs-olive]

Description

• As is added in feat: C++ runtime on Windows #2806 for C++ builds, enable --release flag for builds in main to enable correct nightly versioning on PyTorch index

Type of change

• Address CI Issue

Checklist:

• [ x ] My code follows the style guidelines of this project (You can use the linters)
• [ x ] I have performed a self-review of my own code
• [ x ] I have commented my code, particularly in hard-to-understand areas and hacks
• [ x ] I have made corresponding changes to the documentation
• [ x ] I have added tests to verify my fix or my feature
• [ x ] New and existing unit tests pass locally with my changes
• [ x ] I have added the relevant labels to my PR in so that relevant reviewers are notified

[HolyWu]

wheel-build-params is a bit special. It only has an effect when env-script is also specified. We don't necessarily have to use --release flag here, since setup.py also checks RELEASE env var. So I made the relevant changes.

[gs-olive]

@HolyWu - thanks for this detail. I wanted to add the release specification to the nightly builds in advance of getting your PR #2806 merged, and to get this change to another branch which only has the Python runtime for Windows. I can cherry-pick your env var commit 6b7a9e0 into this PR instead

Update: Cherry-picked and reformatted the change to only include the environment variable insertion to get main and release/2.3 updated in advance of #2806 getting merged

[narendasan]

LGTM