AG-891: Use Record for split screen input playout contents

[KvelaGorrrrnio]

Context

Note

Jira ticket: https://tv2cms.atlassian.net/browse/AG-891

This PR fixes the issue where inserting sources into an empty split screen box, other than the first one, crashes the Alba TV 2 server. The reason for this is a serialization-issue caused by a mismatch in types.
Alba server models the types for playout content for split screen inputs as a record, but the implementation uses arrays.

From this, the code

const inputPlayoutContents = []
inputPlayoutContents[3] = { type: 'CAMERA', ... }

will be serialized to

[null, null, null, { type: 'CAMERA', ... }]

Change description

The implementation is changed to using records instead of arrays.

Warning

This above change requires changes in Alba TV 2 server as that depends on the type to be a list - not a record.

Additionally, the playout content type attributes are marked as readonly as they are, and should, only be modified when created.

The package qs is also fixated to >=6.14.1 as to avoid the memory exhaustion DoS vulnerability found in previous versions.

Checklist

• The changes are documented.
• Core logic is covered by tests.

[github-actions]

Coverage Report for tv2/alba-server

Status	Category	Percentage	Covered / Total
🔵	Lines	74.5%	2899 / 3891
🔵	Statements	74.32%	3028 / 4074
🔵	Functions	69.62%	832 / 1195
🔵	Branches	67.67%	741 / 1095

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/blueprints/domain/services/action-factories/tv2-split-screen-action-factory.ts	48.84%	20.4%	40.67%	48.81%	109-149, 270-288, 296, 360-461, 580-583, 611-700, 751-827

Generated in workflow #1394 for commit d86dc86 by the Vitest Coverage Report Action