[Fleet] Apply experimental data stream settings on package install

[juliaElastic]

While adding support for experimental data stream settings like TSDB and synthetic_source, the logic of updating corresponding Component Templates and Index Templates is only done while creating/updating package policies.

During testing it turned out that these settings should be applied on package install time as well.

For TSDB, the package can have the setting enabled by default on a data stream by setting index_mode: "time_series".
The package install logic should apply this setting, by updating the settings of the Index template.

Similarly, if the source_mode: synthetic is set in the package, the synthetic_source setting should be enabled by default and the Component template changes should be applied.
Related: #141211

Related: #132818

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[juliaElastic]

Duplicate of #146804