Fix Go generation deleting non-generated repo tooling (.config, .azure-pipelines)

clean-go-files.ps1 removes every top-level directory in the target repo except a
hardcoded allow-list (core, scripts, .github, tests) before regenerating. That
allow-list has not changed since 2023-06-12, so directories added since then are
deleted wholesale on every generation run.

msgraph-sdk-go / msgraph-beta-sdk-go recently gained:
- .azure-pipelines/  (added 2026-05-15; daily-ci-build.yml)
- .config/           (added 2026-05-27; 1ES autobaselining + Guardian .gdnbaselines)

Because these are not in the allow-list and are not regenerated by kiota, every
Go generation run deletes them. This surfaced in the first generation PRs created
after those files were added (e.g. msgraph-sdk-go #1013/#1014, msgraph-beta-sdk-go
#649), each dropping .azure-pipelines/daily-ci-build.yml,
.config/1espt/PipelineAutobaseliningConfig.yml and .config/guardian/.gdnbaselines
(removing Guardian security-scan baselines).

Fix: exclude ALL dot-directories via the ".*" wildcard (matches .github, .config,
.azure-pipelines, .vscode, .devcontainer, ...) in addition to core/scripts/tests.
Generated model/request-builder directories never start with a dot, so they are
still cleaned. Both v1.0 and beta Go stages share this script (go.yml@self), so this
single change fixes both repos.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jingjingjia-ms

scripts/clean-go-files.ps1

@@ -1,4 +1,8 @@
-$directories = Get-ChildItem -Path $env:MainDirectory -Directory -Exclude @("core", "scripts", ".github" , "tests")
+# Only generated model/request-builder directories should be removed before regeneration.
+# Exclude hand-maintained folders and ALL dot-directories (".*" matches .github, .config,
+# .azure-pipelines, .vscode, .devcontainer, etc.) so repo tooling, CI and security-baseline
+# config are not deleted by generation runs.
+$directories = Get-ChildItem -Path $env:MainDirectory -Directory -Exclude @("core", "scripts", "tests", ".*")
 foreach ($directory in $directories) {
 	Remove-Item -Path $directory.FullName -Recurse -Force -Verbose -Exclude *change_notification*, "change_type.go", "lifecycle_event_type.go", "resource_data.go", "resource_permission.go" , "resource_permission_collection_response.go"
 }