fix(agent-installer): show Agent Tunnel dialog for ADDLOCAL=ALL

[irvingouj@Devolutions (irvingoujAtDevolution)]

What

Wizard.ShouldSkip decided whether to skip the Agent Tunnel wizard dialog by matching the F.Tunnel feature id literally in ADDLOCAL. ADDLOCAL=ALL installs every feature (Agent Tunnel included) without naming them, so the dialog was wrongly skipped — the operator never got a chance to enter an enrollment string even though the tunnel feature was being installed.

ShouldSkip now also recognizes the ALL keyword. Tokens are matched case-sensitively, the same way Windows Installer matches ADDLOCAL feature names and the ALL keyword, so the dialog decision stays in lockstep with whether MSI will actually install the feature (and therefore run EnrollAgentTunnel).

Why

From Benoit's post-merge audit of #1789 (finding P9).

Verification

Truth table over ALL / all / F.Tunnel / f.tunnel / F.Agent,F.Tunnel / F.Agent / empty — every case now agrees with MSI's actual (case-sensitive) install decision: correctly-cased ALL / F.Tunnel show the dialog, anything that wouldn't install the feature skips it. The interactive path never emits ADDLOCAL=ALL (it writes explicit feature names), so the ALL branch only matters for command-line installs.

Note

An earlier revision of this branch also changed the empty-enrollment-string behavior (audit finding P2) to a silent no-op skip. That was reverted — an empty enrollment string keeps failing the install intentionally: the Agent Tunnel feature is opt-in (not installed by default), so selecting it without a string is a misconfiguration that should surface rather than be silently skipped. Context: #1789 (comment)

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