[4.0] [plg_sampledata_multilang] Add missing checks

[SharkyKZ]

Pull Request for Issue # .

Summary of Changes

Adds context check in last step. Fixes weird alert when installing Testing Sample Data.

Testing Instructions

1. On monolingual site install Testing Sample Data. Inspect progress messages.
2. On multilingual site install Multilingual Sample Data. Inspect progress messages.

Expected result

1. Messages appear normally.
2. Works like before.

Actual result

1. Empty space appears between step 7 and step 8 messages.

Documentation Changes Required

No.

[brianteeman]

I have tested this item ✅ successfully on e3ebc69

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[infograf768]

@SharkyKZ
If checking session is necessary for this plugin concerning the last Step, then it is also necessary for blog sample data as we only have there

	public function onAjaxSampledataApplyStep4()
	{
		if ($this->app->input->get('type') != $this->_name)
		{
			return;
		}

I suggest to also correct that one in this PR.

[SharkyKZ]

Not really necessary in the last step.

[infograf768]

I have tested this item ✅ successfully on a03ac6e

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[Quy]

RTC

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[wilsonge]

Thanks!