Fix missing Terminal Shortcuts for "shoot" and "cp" scopes.

[Lappihuan]

What this PR does / why we need it:
This fixes a bug that broke all "shoot" and "cp" scope while refactoring the state management:
4b4c510#diff-abeb7e9d3448e309c3fc4a7cc959611852d5242b0fcf58540b063f494b131b04L41

The prop shootItem used to be passed to GTerminalShortcuts component, this was removed but the component still relies on the object to be present for it to include the terminal shortcuts as seen here:

dashboard/frontend/src/components/GTerminalShortcuts.vue

Lines 137 to 139 in 2b0f0ae

	if (this.shootItem) {
	targetsFilter.push(TargetEnum.SHOOT, TargetEnum.CONTROL_PLANE)
	}

But this.shootItem was never set anymore in any parent component as prop:
https://github.com/search?q=repo%3Agardener%2Fdashboard+%22%3Cg-terminal-shortcuts%22&type=code

this PR get the shootItem via the useShootItem composable the same way as in the GTerminalShortcut.vue:
4b4c510#diff-3925a06cd814d08ed6d969e9c3553128a5b66d2b5415c735374bd5b1fe2315efR132-R142

With this change all three scopes "garden", "cp" and "shoot" shortcuts are shown again correctly

Which issue(s) this PR fixes:

Special notes for your reviewer:

Release note:

fixes missing terminal shortcuts for "shoot" and "cp" scopes

[CLAassistant]

All committers have signed the CLA.

[gardener-robot]

@Lappihuan Thank you for your contribution.

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[gardener-robot]

@holgerkoser, @grolu You have pull request review open invite, please check

[petersutter]

Thank you for providing a fix. I just have minor suggestions

[petersutter]

Suggested change

	shootItem = null,
	shootItem,

[Lappihuan]

this would break the context when coming from the button "GARDEN CLUSTER", since then useShootItem seems to return null.

GTerminalShortcuts.vue:135 Uncaught (in promise) TypeError: Cannot destructure property 'shootItem' of 'useShootItem(...)' as it is null.

this just tries to handle this gracefully so we still end up with shootItem as null.

there might be a better way to solve it in useShootItem to still return a result object instead of just null

[Lappihuan]

this seems to come from this default value here:

dashboard/frontend/src/composables/useShootItem.js

Lines 264 to 266 in 97c1357

	export function useShootItem () {
	return inject('shoot-item', null)
	}

[petersutter]

Suggested change

	} = useShootItem() || {}
	} = useShootItem()

[Lappihuan]

same as above

[petersutter]

Suggested change

	shootItem = null,
	} = useShootItem() || {}
	shootItem,
	} = useShootItem()

[Lappihuan]

same as above

[gardener-robot]

@grolu, @holgerkoser You have pull request review open invite, please check