relicense all paths other than MIT licensed code, client/cody*, jetbr…

…ains, VS code, and browser extension to enterprise (#53345) (#53345)

Preparing for 5.1 based on latest executive decisions. Re-licensing the
majority of sourcegraph/sourcegraph to enterprise instead of Apache.
Official external statements forthcoming with 5.1 release.

[Searching this branch for LICENSE files
](https://sourcegraph.sourcegraph.com/search?q=context:sourcegraph+repo:%5Egithub%5C.com/sourcegraph/sourcegraph%24+file:LICENSE%24+-file:client/cody+rev:cclark/relicense&patternType=standard&sm=1&groupBy=path)

This leaves only 2 licenses in directories other than `client/cody*`
1. MIT code in syntax highlighter
2. MIT code in react-accessible-treeview

Edit: updates from exec team
Jetbrains extension / VS Code extension / browser extension will remain
Apache

Here is a search showing all Apache licensed paths in this branch
https://sourcegraph.sourcegraph.com/search?q=context:sourcegraph+repo:%5Egithub%5C.com/sourcegraph/sourcegraph%24+file:LICENSE%24++rev:cclark/relicense&patternType=standard&sm=1&groupBy=path

If either of those should be changing, please let me know.
## Test plan
N/A
<!-- All pull requests REQUIRE a test plan:
https://docs.sourcegraph.com/dev/background-information/testing_principles
-->

LICENSE

@@ -1,3 +1,3 @@
-LICENSE.apache (Apache License) applies to all files in this
-repository, except for those in or under any directory named
-"enterprise", which are covered by LICENSE.enterprise.
+LICENSE.enterprise (Enterprise License) applies to all files in this
+repository, except for files in or under any directory that contains a
+superseding license file.

README.md

@@ -64,8 +64,6 @@ The `doc` directory has additional documentation for developing and understandin
 
 ## License
 
-This repository contains both OSS-licensed and non-OSS-licensed files. We maintain one repository rather than two separate repositories mainly for development convenience.
+This repository contains primarily non-OSS-licensed files, and some OSS licensed files (for example, IDE extensions). We maintain one repository rather than two separate repositories mainly for development convenience.
 
-All files in the `enterprise` and `client/web/src/enterprise` fall under [LICENSE.enterprise](LICENSE.enterprise).
-
-The remaining files fall under the [Apache 2 license](LICENSE.apache). Sourcegraph OSS is built only from the Apache-licensed files in this repository.
+See the [LICENSE](LICENSE) for an explanation of how files are licensed.

client/extension-api-types/LICENSE → client/browser/LICENSE

@@ -1,3 +1,4 @@
+
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -186,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright [yyyy] [name of copyright owner]
+   Copyright 2023 Sourcegraph, Inc.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.