Remove Copy Query for Web Paste command and related assets

[alex-bochkov]

Motivation

• The legacy "Copy Query for Web Paste" command and its helper implementation were decommissioned and need to be removed to avoid dead code and unused resources.

Description

• Deleted the Commands/CopyQueryAsHtmlCommand.cs implementation and removed its registration from package initialization (AxialSqlToolsPackage.cs).
• Removed the menu/button, keybinding, bitmap entry, command ID symbol, and icon GUID from AxialSqlToolsPackage.vsct to eliminate the command from the VS command table.
• Removed the copy.png resource and the Compile/Content entries that referenced the command and icon from AxialSqlTools.csproj.

Testing

• Verified no remaining references by running rg -n "CopyQueryAsHtml|AxialCopyQueryAsHtmlButton|Copy Query for Web Paste|CopyQueryForWebPaste|guidCopy|bmpCopy|copy\.png" AxialSqlTools which returned no matches.
• Attempted to run dotnet build AxialSqlTools/AxialSqlTools.sln but the build could not be executed in this environment because dotnet is not installed (build not run).

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Codex Task

[alex-bochkov]

The Preview feature in recent versions already solves this.