Option for local timezone timestamps

[1000TurquoisePogs]

This PR adds sensitivity to the "TZ" env var to "zwe", as well as points to zowe/zlux-server-framework#572 which does the same for app-server.

the property zowe.logging.timezone, when set to "LOCAL" or "local", will effect them.

There's a small bootstrapping problem to be solved in the TS code - when is "zowe.logging.timezone" readable? If its set as an env var, the TS code will use it, but it doesn't get set as an env var until some point of execution. This sets it as soon as configmgr is called, but a user could set the env var by some other means too.

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Test workflow 7517 is started.
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The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/3.4.0-PR-4520/zowe-3.4.0-pr-4520-8832-20250930135506.pax
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Test workflow 7520 is started.
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[Martin-Zeithaml]

# ./yaml/zowe.wrong.yaml
zowe:
  logging:
    timezone: Prague

# ./yaml/zowe.local.yaml
zowe:
  logging:
    timezone: LOCAL

# ./yaml/zowe.utc.yaml
zowe:
  logging:
    timezone: UTC

# ./yaml/zowe.none.yaml
zowe:
  environments:
    1: 1

$ /zowe/4520/bin/zwe config validate --config ./yaml/zowe.wrong.yaml
Error: Validation of FILE(./yaml/zowe.wrong.yaml):FILE(/zowe/4520/files/defaults.yaml) against schema /zowe/4520/schemas/zowe-yaml-schema.json:/zowe/4520/schemas/server-common.json found invalid JSON Schema data
Validity Exceptions(s) with object at
  Validity Exceptions(s) with object at /zowe
    Validity Exceptions(s) with object at /zowe/logging
      no matching enum value at /zowe/logging/timezone; expecting one of values '[LOCAL, UTC]' of type 'string'

$ /zowe/4520/bin/zwe config validate --config ./yaml/zowe.local.yaml
2025-09-30 10:58:36 <ZWELS:33883244> USERID INFO (zwe-internal-start-prepare) Zowe version: v3.4.0
2025-09-30 10:58:36 <ZWELS:33883244> USERID INFO (zwe-internal-start-prepare) build and hash: PR-4520#8832 (d168e37072904dce3c94ed47e7e5aa96322cacc2)
Validating Zowe core configuration for file(s)=/tmp/.zweenv-1169/.zowe-merged.yaml
Zowe core configuration is valid

$ /zowe/4520/bin/zwe config validate --config ./yaml/zowe.utc.yaml
2025-09-30 16:58:47 <ZWELS:67438457> USERID INFO (zwe-internal-start-prepare) Zowe version: v3.4.0
2025-09-30 16:58:47 <ZWELS:67438457> USERID INFO (zwe-internal-start-prepare) build and hash: PR-4520#8832 (d168e37072904dce3c94ed47e7e5aa96322cacc2)
Validating Zowe core configuration for file(s)=/tmp/.zweenv-2694/.zowe-merged.yaml
Zowe core configuration is valid

$ /zowe/4520/bin/zwe config validate --config ./yaml/zowe.none.yaml
2025-09-30 16:58:58 <ZWELS:17106650> USERID INFO (zwe-internal-start-prepare) Zowe version: v3.4.0
2025-09-30 16:58:58 <ZWELS:17106650> USERID INFO (zwe-internal-start-prepare) build and hash: PR-4520#8832 (d168e37072904dce3c94ed47e7e5aa96322cacc2)
Validating Zowe core configuration for file(s)=/tmp/.zweenv-8680/.zowe-merged.yaml
Zowe core configuration is valid

The timestamp difference between LOCAL and UTC (or with no logging setting) corresponds to date '+%z'.

[Martin-Zeithaml]

This feature should be in CHANGELOG.

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Test workflow 7526 is started.
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Test workflow 7535 is started.
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Running on machine: zzow11
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