[For 10.4] Support Oracle connect string

[DeepDiver1975]

backport #35413

Description

Some failover/HA configurations in the Oracle world require support of connect strings.
Examples can be found here: https://docs.oracle.com/database/121/HABPT/config_fcf.htm#HABPT5391

This PR adds installation and operations using a new database config parameter: dbconnectionstring in config.php

Motivation and Context

Support Oracle HA/Failover scenarios

How Has This Been Tested?

• basic connectivity is done manually and using drone
• real fail over scenario is to be tested manually as well

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised: Add support for Oracle connections string to support failover setups docs#2127 - THX @mmattel

[codecov]

Codecov Report

Merging #36489 into master will increase coverage by <.01%.
The diff coverage is 31.03%.

@@             Coverage Diff              @@
##             master   #36489      +/-   ##
============================================
+ Coverage     64.68%   64.68%   +<.01%     
- Complexity    19023    19024       +1     
============================================
  Files          1268     1268              
  Lines         74362    74367       +5     
  Branches       1309     1309              
============================================
+ Hits          48100    48104       +4     
- Misses        25876    25877       +1     
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.86% <31.03%> (ø)	19024 <0> (+1)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
core/Command/Maintenance/Install.php	0% <0%> (ø)	21 <0> (+1)	⬆️
lib/private/Setup/AbstractDatabase.php	0% <0%> (ø)	12 <0> (ø)	⬇️
lib/private/Setup/OCI.php	0% <0%> (ø)	35 <0> (-1)	⬇️
lib/private/DB/ConnectionFactory.php	90.41% <100%> (+0.55%)	22 <0> (+2)	⬆️
lib/private/DB/MDB2SchemaReader.php	96.11% <100%> (ø)	76 <0> (-1)	⬇️

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[mmattel]

@DeepDiver1975 @settermjd needs documentation?

[phil-davis]

Existing CI demonstrates at least that ordinary Oracle database install has not been broken ;)
Then see comment #35413 (comment)
How to do something manually to test with an Oracle HA/failover configuration?

[DeepDiver1975]

It is not the reaponsibility of our testing setup to test oracles failover capabilities. I so assume this works 🤗

This pr allows the necessary setups of the Database connection in owncloud.