fix: handle parameters for view filters

[jorwoods]

Closes #1632

Parameters need to be prefixed with "vf_Parameters." in order to be properly registered as setting a parameter value. This PR adds that prefix where it was missing, but leaves parameter names that already included the prefix unmodified.

[Copilot]

Pull Request Overview

This PR adds automatic prefixing of parameter names with vf_Parameters. to ensure consistent formatting when using the parameter() method. The changes handle three scenarios: plain parameter names get the full prefix added, names starting with "Parameters." get "vf_" prepended, and names already prefixed with "vf_Parameters." are left unchanged.

• Automatic prefixing logic for parameter names in the parameter() method
• Support for flexible parameter name input formats
• Updated test cases to verify the new prefixing behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
tableauserverclient/server/request_options.py	Added prefix normalization logic to handle different parameter name formats
test/test_request_option.py	Added new test cases for different parameter name prefixes and updated assertions to expect normalized parameter names

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[jorwoods]

To restate on the PR: copilot recommends changing "vf_Parameters" to "vf_parameters". But the Tableau Server query parameter is case sensitive, so it has to be "vf_Parameters". Below is a sample script I used to test this.

import os

from dotenv import load_dotenv
import tableauserverclient as TSC

load_dotenv()

server = TSC.Server(os.environ["TABLEAU_SERVER"], use_server_version=True)
auth = TSC.PersonalAccessTokenAuth(os.environ["TOKEN_NAME"], os.environ["TOKEN_SECRET"], site_id=os.environ["TABLEAU_SITE"])
with server.auth.sign_in(auth):
    view = server.views.filter(name="test", workbook_name="Superstore", project_name="Samples")[0]
    opts = TSC.CSVRequestOptions()
    opts.parameter("Check", "sent")
    server.views.populate_csv(view, opts)
    for line in view.csv:
        print(line.decode("utf-8").strip())