docs: address dotnet 6 deprecation issues

[petar-i-todorov]

Closes https://github.com/telerik/reporting/issues/5021.

[Copilot]

Pull Request Overview

This PR updates the documentation to address .NET 6 deprecation issues by clarifying the description of globalization-invariant mode and replacing hardcoded .NET version references with a dynamic variable.

• Updated globalization-invariant text in multiple documentation pages to refer to .NET in general.
• Replaced explicit ".NET 6 SDK" mentions with a templated version using {{site.mindotnetversion}} across several documents.
• Adjusted the Standalone Report Designer and configuration documentation to align with the new versioning approach.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
embedding-reports/spa-reporting.md	Revised globalization-invariant mode text to be version-agnostic.
embedding-reports/overview.md	Updated requirements section with clear globalization-invariant mode description.
embedding-reports/host-the-report-engine-remotely/asp.net-core-web-api-implementation/host-reports-service-in-.net-with-controllers.md	Replaced explicit .NET 6 reference with a dynamic version variable.
embedding-reports/host-the-report-engine-remotely/asp.net-core-web-api-implementation/host-reports-service-in-.net-6-with-minimal-api.md	Updated .NET version reference to use the templated version.
embedding-reports/host-the-report-engine-remotely/asp.net-core-web-api-implementation/host-reports-service-in-.net-5.md	Replaced explicit .NET 6 reference with the site variable.
embedding-reports/blazor-reporting.md	Revised globalization-invariant mode text to be more generic.
embedding-reports/asp-net-core-reporting.md	Updated globalization-invariant mode description with generic .NET references.
doc-output/configure-the-report-engine/processing-element.md	Adjusted GDI exception conditions to use the dynamic .NET version variable.
designing-reports/report-designer-tools/desktop-designers/standalone-report-designer/overview.md	Updated framework target information with the new templated version.
designing-reports/connecting-to-data/data-source-components/sqldatasource-component/connecting-the-sqldatasource-component-to-a-data-source.md	Simplified configuration file guidance by removing specific .NET version references.

Comments suppressed due to low confidence (3)

embedding-reports/host-the-report-engine-remotely/asp.net-core-web-api-implementation/host-reports-service-in-.net-with-controllers.md:21

• Verify that the variable substitution '{{site.mindotnetversion}}' renders the expected .NET version in the published documentation. Consider confirming that this update aligns with the intended versioning strategy.

* [.NET {{site.mindotnetversion}} SDK](https://dotnet.microsoft.com/download/dotnet/{{site.mindotnetversion}}.0) or higher

designing-reports/report-designer-tools/desktop-designers/standalone-report-designer/overview.md:24

• Ensure that updating the target framework to use '{{site.mindotnetversion}}' is consistent with related documents and accurately reflects the supported .NET version across the product literature.

Starting with [R3 2022 (16.2.22.914)](https://www.telerik.com/support/whats-new/reporting/release-history/progress-telerik-reporting-r3-2022-16-2-22-914), a new version of Standalone Report Designer is available. It is named Telerik.ReportDesigner.Net and targets .NET {{site.mindotnetversion}}.

doc-output/configure-the-report-engine/processing-element.md:152

• Check that the updated version condition using '{{site.mindotnetversion}}' correctly represents the minimum version for GDI compatibility since the previous documentation mentioned .NET 7. Clarify this requirement if necessary.

|Attributes| __engineName__ – required string attribute. Determines the type of the [Telerik.Drawing.Contract.GraphicsEngine](/api/Telerik.Drawing.Contract.GraphicsEngine) used in the application. Available values:<ul><li>__Gdi__ - the application will use GDI graphics engine. On non-Windows platforms in applications that target .NET {{site.mindotnetversion}} or higher framework.</li></ul>|