Add Backwpup Start Jobs with Links plugin to enable job initiation via links

[Honemo]

Description

Allows users to activate external/secure links to launch a backup with a filter

Type of change

• New feature (non-breaking change which adds functionality).

Detailed scenario

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Technical description

Documentation

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New dependencies

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Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

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Additional Checks

• In the case of complex code, I wrote comments to explain it.
• When possible, I prepared ways to observe the implemented system (logs, data, etc.).
• I added error handling logic when using functions that could throw errors (HTTP/API request, filesystem, etc.)

[wordpressfan]

Just a minor change.
Thanks @Honemo

[wordpressfan]

Suggested change

	add_filter( 'backwpup_allow_job_start_with_links', __NAMESPACE__ . '\allow_start_with_links' );
	add_filter( 'backwpup_allow_job_start_with_links', '__return_true' );

[wordpressfan]

No need to have this function.