Create a Python virtual environment

[nataliefiann]

What are you changing in this pull request and why?

I have created this PR following this Git issue: #2143 to guide users on how to create a Python virtual environment

Closes: #2143

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

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🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-new-branch-name-ve-dbt-labs.vercel.app/docs/core/pip-install

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[nataliefiann]

Querying the .venv folder as out docs don't ref it: https://dbt-labs.slack.com/archives/C05FWBP9X1U/p1734723735789049

[mirnawong1]

thanks @nataliefiann , approved and have a sugg to make the headers flow better since the other sections related to actual installation are nested under the 'python env' header. and the prereqs are for the entire page/

sug something like this:

# Install with pip
....
## Using virtual environments
...
### Prerequisites
....

### 1. Create a virtual environment

### 2. Activate the virtual environment
....

### 3. Deactivate the virtual environment (optional)
....

### 4. Create an alias (optional)

## Install dbt Core and adapters
...

### 1. Install dbt Core and an adapter
...

### 2. Upgrade adapters
...

### 3. Install dbt Core only
....

## Change dbt Core versions
....
## pip install dbt
....
## Install prereleases
....

[github-actions]

⚠️ [vale] _{reported by reviewdog 🐶}
[custom.SentenceCaseHeaders] 'Change dbt Core versions' should use sentence-style capitalization. Try 'Change dbt core versions' instead.